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WE WILL LIGHTEN !
Project report staked
University Picardie Jules Vernes
DUT GEII 1 year
Year 2017-2018
Mr.SIVERT

LEHIRACHE Dounia MAIER Adrien AHAMMOU Youssef GILLOTIN Alix

p. 1

To begin, we would like to extend a big thanks to all the
people who helped us throughout our project.
Whether through their teaching during this year, or
directly related to our project.
We would also like to warmly thanks the University of
Picardie Jules Vernes, IUT of Aisne and the Department
GEII who have provided us with the necessary
infrastructure to complete our studies and acquire the
knowledge essential to the smooth running of our project.
And in particular Mr SIVERT, our tutor, for his help in
solving problems related to the project throughout the
year. We also wanted to thank Mr FAQIR for his
involvement and his advice that allowed us to move
forward and structure our project, as well as Mr CHRIFI
who was available to allow us to move forward on our
project.

All the participants of this project

p. 2

INTRODUCTION
3 million is the number today of user cycles in France almost as much LED lighting are
needed. Safety is an important issue, so the state has put in place the mandatory bicycle
lighting law. In the space of a few years, the evolution of LED lighting has become very
important, in fact light-emitting diodes have made it possible to improve front and rear
lighting capabilities. The price of these can vary from 5 to 200 €. The autonomy of 2 to 6
hours, is a major asset of these types of lighting.
But, between traders who are trying everything to sell their products and customers who
are, for the majority, unable to differentiate the good and the bad, and offers more and
more numerous, are we sure not to deceive us? Do manufacturers give correct values?
How to choose your lighting?
We decided to take things in hand by creating a guide that will make it easier for the
consumer. Indeed, by performing our own measurements and comparing them with that
of the manufacturer, we will create a web interface where the user can access our work.
This required a good organization of tasks, we divided our work into 4 main tasks: the
first consists of research and documentation, the second concerns the measurement and
testing of lamps then the collection of data and finally the realization of a Web page.
In a first part we will present the project, then the study of it, then we will explain the
technical realization, in a third part we will see how we disseminated the information,
and finally we will conclude.

p. 3

Table of contents
Project display ......................................................................................... 5
Context and condition of work ....................................................................5
Specifications .......................................................................................................5
Project planning ...................................................................................................6

Project study ............................................................................................ 7
Reminder on the lights ....................................................................................7
What is an LED ? ..................................................................................................9
Technical realization ......................................................................... 12
Front LED case studies ................................................................................ 12
« Bubble » LED case studies ....................................................................... 29
User information ................................................................................ 37
Home page .......................................................................................................... 37
Menu ...................................................................................................................... 39
The site .................................................................................................................. 41
Conclusion and perspectives .......................................................... 46
Sources ................................................................................................... 47

p. 4

Project display

Context and condition of work
During this school year, we had to carry out a tutored project, this one as part of our
training in industrial computer electrical engineering. At the beginning of this year we
learned about our subject "LED lighting" it was imposed on us, however we were able to
become aware of the commitment that it implies what motivated us. Indeed, even on our
small scale we can help consumers buy at the best price.
Mr Sivert, after having explained us the objectives to reach as well as the unfolding, put
at our disposal the room of works of realization, we could thus use a luxmeter which
was our principal tool of work as well as all the material necessary for the realization of
our project.

Specifications
The goal is to test different lighting before to compare them. Indeed the manufacturers
give very little technical information on their lighting.
Different tests are possible: efficiency of the converter, efficiency of the led,
concentration of the reflector. These three features make it possible to synthesize the
front lighting.
We first carried out a through documentation in order to master our subject, then in a
second shot we took the measurements of a lighting with a luxmeter and then measured
its absorbed power. In addition we compared the measurements of the luxmeter with a
smartphone. The last step of our specifications is to put the data obtained in Excel.

p. 5

Project planning

1

• Week 45 to Week 49
• Documentation, research, mastery of the subject

2

• Week 50 to Week 13 (2018)
• Realizatation of test, manipulation luxmetre

3

• Week 7 to Week 20
• Realization of the tables, excel sheet , Poster

4

• Week 20 to Week 22
• Comparative data

5

• Week 11 to Week 20
• Realization of a database

6

• Week 14 to Week 22
• Realization of the video, as well as the report

p. 6

Project study
Documentations, research
Reminder on the lights
Power
The power of lighting, is communicated in watt (W) it corresponds to the electrical
energy that it consumes.
The power of LED lamps is expressed in lumens (lm), wich corresponds to the energy of
the luminous flux that it produces. As a result, the higher the lumen rate, the greater the
light emitted.

Light output
The light output corresponds to an efficiency indicator of the LED, in fact it allos to
express the conversion of electrical energy into light. It is expressed in lumen/W.
Lamp type
Incandescent lamps
Halogen lamps
Fluorescent lamps called ‘economic’
Led lamp

Light output
15 Lumen/Watt
25 Lumen/Watt
60 Lumen/Watt
80-100 Lumen/Watt

LEDs are more used for outdoor lighting because they consume less and have better
performance. In fact they consume 5 to 10 times less watts than an incandescent lamp.

The lumen, a reference
The lumen, is a unit of measure that measures the luminous flux.
So you have to mach watts of the « classic » lamps to the LED lamps, in order to compare
them. We can therefore use lumens and not Watt
WATT
6-9
8-12
9-13
16-20
25-28

LUMEN
450
800
1100
1600
2600

p. 7

The efficiency
It is the ratio between the luminous flux F in lumens and the power

Light cone and radiation angle
LED lamps allow to focus the light more or less wide is the light cone of the lamp.

It can be seen that the further away from the lamp the larger the illuminated surface.

The illumination
It corresponds to 𝐸(𝑙𝑢𝑥) =

𝑃𝑢𝑖𝑠𝑠𝑎𝑛𝑐𝑒 (𝑙𝑢𝑚𝑛𝑒𝑛)
𝑆𝑢𝑟𝑓𝑎𝑐𝑒 (𝑚2 )

=

𝑃𝑢𝑖𝑠𝑠𝑎𝑛𝑐𝑒 (𝑙𝑢𝑚𝑒𝑛)
𝜋−(𝑡𝑎𝑛𝜃−𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒)2

The further we get from the light source, the more the illumination of the surface will
decrease.

p. 8

What is an LED ?
Light Emitting Diode
A light emitting diode (LED) corresponds to an opto-electronic device, that is to say that
it includes a branch of electronics and photonics, which interacts with light.
The LEDs thus make it possible to emit light, when the latter is powered by an electric
current.
It functions on the one hand as a diode that is to say that lets a current flow in one
direction and in a second time emits light.

A page of history

1907

• Henry Round "the curious phenomenon"
• First light emission by a semiconductor.

1962

• Nick Holonyak
• LED emitting in the red

1991

• Shuji Nakamura
• Blue LED that can produce white LEDs

2000
2013

• Power LED production
• the efficacity of marketed LEDs exceeds
the best fluorescent tubes

Operation
Diode
Like a diode, it is composed of two pokes, the anode and the cathode, so it only lets the
current flow in one direction.

Electroluminescence

p. 9

The principle is to produce an electron deficit in an area (p) and an excess in another
area (n). When the two intersect "the electron holes" combine and generate photons
that allow the creation of light.

Lifetime
LEDs have long life, it is estimated between 25000 and 50000 hours. For comparaison,
the lifetime of an incandescent lamp is 50 times lower.
This longevity can be explained by its low consumption.

AN LED, a color temperature
Kelvin is used to measure the temperature of a color. The lower the temperatre of a led,
the more the lends tends to red, so the higher the temperature, the more the light will be
blue-toned.

Brief reminder of the different brands
American company, specialized in technological innovation
in led components.
It is one of the best levels of performance.
It is today considered one of the best on the market. On the
other hand, their price remains higher.

They correspond to the Philps led brand. They are today
considered among the best. They are among the most
expensive on the market

p. 10

The largest Taiwanese manufacturer of led.
Specialized in high gloss LEDs, they are among the best in
the market.
Japanese leader of LED components.
It remains of a good quality, with a good performance.

But other brands have established themselves, more low-end, indeed their low cost
attracts the consumer more towards these LEDs, they are imposing today on the market,
such as a brand from China where manufacturers do not are not always honest about
their performance, and or the datasheet is not always complete or lacks transparency.
But this also affects the major brands know to the general public.

Conclusion
To conclude, to choose the right lamp, you have to take into account several parameters,
first, know the distance between the light source and the surface to be illuminated. In a
second step, we choose the led lamp having a radiation angle that corresponds to the
desired surface.
Finally, we choose the power necessary to ensure the desired illumination.It is therefore
possible by combining all these parameters to choose the right LED.

p. 11

Technical realization

Front led case study

Minimum specifications
In order to give a guideline to our measurements we have established a minimum
specification of the lighting :
You have to be seen at 100 meters and see between 7 and 10 meters for a speed less
than or equal to 20km/h.
The higher the speed, the more you have to be able to see far.
To see in the streets, roads, it takes betwen 15 and 50 lux.
For speeds less than or equal to 45 km/h it is necessary to see between 15 and 30
meters.
Our goal : to be able to use your bike in the middle of the night at 40 km/h.
We will use these specifications to study our measures. Thanks to the measurements of
illumination according to the distance we will be able to determine the rate of
illumination for a desired distance (here 15 meter) and thus know if the lamp in
question would be acceptable for our specifications.
The lux measurements according to the radius will give us a glimpse of the shape of the
halo of the lamp, that is if it is rather focused on the front or if it also illuminates the
edges. (useful for visualizing roadways for example)
In addition, these measurements will make it possible to calculate lumens and, thanks to
the power provided in the manufacturer data and / or that we will have determined by
measurement, to calculate the lumens / Watt of each lamp.
In this case study we studied 4 front, cycling, all different, both in their appearence, their
beams and in the results obtained. Results that we can compare with the manufacturer
data.
On some measures we will have decreased the extent in order to focus on the values that
are of interest (ie 15 meters for lux measurements as a function of distance).
After determining the number of lumens / Watt of each lamp we will ask how to
increase this number of lumens. To do this we will study in addition two different
Bubble Led 1 W (a hot and a cold).
This allowed us to return more in handling and editing in addition to the usual
measurements.

p. 12

Front leds measurements
We made our measurements on the front LEDs.
First of all, the measurements of illumination as a function of distance.
In order to be the most faithful to reality, we placed the lamps at a height of
approximately one meter (bike handlebar height) and slightly inclined towards the
ground.

p. 13

Illuminance in lux according to the distnce in meter of the lamp
It allows us to determine how far this lamp is able to illuminate us properly. And so
compare the manufacturer's data to those we collected. And also to know if this lamp fits
our specifications.
Then we measure the illuminance over several distances, we stopped at 17.5 meters.
From these measurements we could deduce curves informing us about the capabilities
of these lamps to meet the specifications on which we based ourselves.
These results will be presented in a second part of the case study.
Then we measured the illuminance according to the radius.
The lamps placed a few tens of centimeters from the wall, we could measure the
illuminance according to the radius of the halo of it.

Thus we were able to determine the lumens and lumens / watt of each lamp studied.
On the other hand, if the halo is not circular, it must be done differentely.

p. 14

In addition, we measured Lux by distance using a lux meter supplied to the laboratory
and also using a smartphone application.
This allowed us to compare two values for an exact distance and see if these two values
were more or less close.

p. 15

Lamp 1

Recap chart of the different characteristics of the lamp 1
Model
GHB 2
Power
10W
Mode 1
2,5  3 hours
Mode 2
5  6 hours
Luminous flux
900 lumens
Graphic representing the illuminance in lux according to the distance in meter of the
lamp 1
2000

lamp 1

1800

Illuminance (Lux)

1600
1400
1200
1000
800

Luxmetre

600

Telephone

400
200
0
0

5

10

15

20

Distance (m)

p. 16

70

lamp 1

Illuminance (lux)

60
50
40
30

Luxmetre
Telephone

20
10
0
5

7

9

11

13

15

Distance (m)

17

19

From 15 meters we get at best 17 lux.
We thus compared the number of lux provided by a telephone thanks to the « lux
meter » application as well as with a luxmetre.
Graphic representing the number of lux according to the angle in cm of the lamp 1

angle lamp 1
4500
4000
3500
3000
2500
2000
1500
1000
500
0
0

5

10

15

20

25

30

35

40

This graphic gives us an idea of the shape of the halo of the lamp. Moreover, it allows us
to determine the lumens according to the radius of the halo as well as the lumens / Watt.

p. 17

Graphic representing lumens according to the radius of the lamp 1
30,00

lumens lampe 1

25,00

lumen

20,00
15,00
10,00

Lumens

5,00
0,00
0

5

10

15

20

25

30

35

40

Radius (cm)

We are now able to determine the number of lumens of the lamp.
Here it is 115.81 (total lumens obtained by halo radius) which we then divide by the
lamp power (7.8W).
We thus obtain a rate of 14.8 lumens/Watt.

p. 18

Lamp 2

Recap chart of the different characteristics of the lamp 2
Model
Sunspeed
Power
3W
Mode 1
??
Mode 2
??
Mode 3
??
Luminous flux
300 lumens
?? : not supplied by the manufacturer

p. 19

Graphic representing the illuminance in lux according to the distance in meter of the
lamp 2
7000

lamp 2

Illuminance (Lux)

6000
5000
4000
3000

Luxmetre

2000

Telephone

1000
0
0

5

10

15

20

Distance( m)

The shape of the curve is identical and we will focus on the measurments around 15
meters which are more notable on thefollowing graphic.
180

lamp 2

160

Illuminance (lux)

140
120
100
80

Luxmetre

60

Telephone

40
20
0
5

7

9

11

13

Distance (m)

15

17

19

We are here at 40 lux at 15 meters, which is better than the previous lamp.

p. 20

Graphic representing the number of lux according to the angle in cm of the lamp 2
500

angle lamp 2

450
400
350
300
250
200
150
100
50
0
0

5

10

15

20

25

30

35

40

Here we have a halo of light much more constant, however a fall from 30cm radius.

Graphic representing lumens according to the radius of the lamp 2
18,00

lumens lampe 2

16,00
14,00
12,00

lumen

10,00
8,00
6,00

Lumens

4,00
2,00
0,00
0

5

10

15

20

25

30

35

40

Radius (cm)

We determine the total number of lumens of this lamp.
It is here of 72047 that we then divide by the power of the lamp (3 W).
We thus obtain a rate of 24.15 lumens / Watt.

p. 21

Lamp 3

Recap chart of the different characteristics of the lamp 3
Model
YT-T6
Power
10W
Mode 1
2,5  3 hours
Mode 2
5  6 hours
Luminous flux
900 lumens

Graphic representing the illuminance in lux according to the distance in meter of the
lamp 3
4000

lamp 3

3500

Illuminance (lux)

3000
2500
2000
1500

Luxmetre

1000

Telephone

500
0
0

5

10

Distance (m)

15

20

On the zoom of the following graphic we notice the value of 17 lux at 15 meters which
brings us closer to the value found in the test of the 1st lamp.

p. 22

70

lamp 3

Illuminance (lux)

60
50
40
30

Luxmetre
Telephone

20
10
0
5

7

9

11

13

15

Distance (m)

17

19

Graphic representing the number of lux according to the angle in cm of the lamp 3
9000

angle lamp 3

8000

Illuminance (Lux)

7000
6000
5000
4000
3000
2000
1000
0
0

5

10

15

20

25

30

35

40

Radius (cm)

We can notice that the shape of this curve is particular, indeed it means that this lamp
has a halo of focused light and that beyond 15 cm of radius the lamp no longer lights.
It therefore has a much more focused beam forward than on the edges.

p. 23

Graphic representing lumens according to the radius of the lamp 3
60,00

lumens lampe 3

50,00

lumen

40,00
30,00
20,00

Lumens

10,00
0,00
0

5

10

15

20

25

30

35

40

Radius (cm)

The total number of lumens here is 99.75 which we divide by 3,6 W (Determined power).
We obtain a rate of 27,7 lumens/Watt.

p. 24

Lamp 4

Recap chart of the different characteristics of the lamp 4
Model
B TWIN
Power
??
Power mod
2 hours
Medium mod
3,5 hours
Economic mod
7 hours
Flash mod
4 hours
Luminous flux
210 lumens max

p. 25

Graphic representing the illuminance in lux according to the distance in meter of the
lamp 4
2500

lamp 4

Illuminance (Lux)

2000
1500
1000

Luxemetre
Telephone

500
0
0

5

10

15

20

Distance (m)

Always the same general shape and below, we can see 13 lux at 15 meter.
50

lamp 4

45

Illuminance (lux)

40
35
30
25
20

Luxmetre

15

Telephone

10
5
0
5

7

9

11

13

Distance (m)

15

17

19

p. 26

Graphic representing the number of lux according to the angle in cm of the lamp 4
6000

angle lamp 4

5000
4000
3000
2000
1000
0
0

5

10

15

20

25

30

35

40

Herre we have a wider halo that better illuminates the edges unlike the previous lamp.
Graphic representing lumens according to the radius of the lamp 4

lumens lamp 4

30,00
25,00

lumen

20,00
15,00
10,00

Lumens

5,00
0,00
0

5

10

15

20

25

30

35

40

Radius (cm)

With a total of 91.3 lumens that wedivide by 5.5W (Power obtained by measurement)
we get a total of 16.6 lumens /Watt

p. 27

Conclusion front lamps
Conclusion of the study of the 4 front bicycle lamps compared to our minimum lighting
specifications :
Theses measures allowed us to quantify the capacity of these 4 lamps to satisfy our
specifications.
We observe that the illumination rate from 15 meters is already very low, 13 and 17 Lux
for 15 Lux minimum.
Except the lamp 2 which arrives at 40 Lux, however its capacity to illuminate beyond 20
meters while satisfying the specifications is not assured.
160

Lamps comparison

140
120
100
lampe 2

80

lampe 1

60

lampe 3
lampe 4

40
20
0
5

7

9

11

13

15

17

19

In addition, we measured Lux by distance using a lux meter supplied to the laboratory
and also using a smartphone application.
This allowed us to compare two values for an exact distance and see if these two values
were more or less close. So we were able to say that our measurement was correct and
that the accuracy of the application was acceptable.

p. 28

« Bubbles » led case studies

After doing this study andcollecting lumen values, we did a complementary study to find
out how to gain lumens.
So we studied two 1W « Bubbles » led
We did the same measure of lux according to the radius and also a measurement of
temperature.

« Bubbles » led cold and hot.

Measurements of the leds hot and cold bubbles.
Wee welded the « bubble » led on a radiator to dissipate its heat emitted.

We installed the set (Led + radiator) at ten centimeters from the wall to measure the
illumination and the temperature.
We vary these parameters by increasing the value of the current ( 0.1 A  0.5 A).

p. 29

Then we made a measure of illumination according to the radius of the agnle.
This allowed us to determine the number of lumens as well asa the number of
lumens/Watts.
Wiring of the assembly

Pictures of the temperature measurement

p. 30

Measurements
Here are the first values obtained for the two « bubble » led.
Cold bubble led
radius(cm) lux
lumen
0 2537
0,00
5 1297 10,18145
10 542 12,7641
15 192
7,536
20
83 4,56085
25
39 2,75535
30
23 1,98605
35
14
1,4287
40
11 1,29525
45
6
0,8007
50
2
0,2983
total

power

43,61

1W

lumen/watt

43,61

Graph showing lumens by radius
14,00

Cold bubble Led lumens

12,00
10,00

lumen

8,00
6,00
4,00

Lumens

2,00
0,00
0

10

20

30

40

50

60

Radius (cm)

On this curve we observe the highly concentrated halo of this led.
In the table below we can notice the temperature of the LED up to 100°C
Also the decrease of the illuminance from 0.4A, this was followed by a color variation of the
LED (from white toblue).
This proved that it was a 1W LED and the manufacturer data was correct.
3𝑉
=1𝑊
0,3 𝐴

p. 31

Voltage
Current
Lux 10cm
T°C

0,1
995
34

3V
0,3
2500
58

0,2
1844
42

0,4
2750
74

0,5
1500
100

Now let’s move on to the measure of the hot « bubble » led.
Hot « bubble » led
radius(cm)
lux
lumen
0 2400
0,00
5 1650
12,9525
10
580
13,659
15
230
9,0275
20
115
6,31925
25
60
4,239
30
34
2,9359
35
24
2,4492
40
16
1,884
45
12
1,6014
50
9
1,34235

Power

total

1

56,41

lumen/watt

56,41

Graph showing lumens by radius
16,00

Hot bubble Led lumens

14,00

Eclairement (Lux)

12,00
10,00
8,00
6,00
Lumens

4,00
2,00
0,00
0

10

20

30

40

50

60

Radius (cm)

p. 32

The halo remains concentrated and the curve retains an identical look despite the peak
being flattened.
In the table below we can notice that the temperature is almost identical for each measure,
however, the illuminance is doubled at 0.5 A.

Voltage
Current
Lux 10cm
T°C

0,1
950
35

0,2
1930
39

3V
0,3
2480
41

0,4
2940
65

0,5
3100
93

Thanks to these measures we could notice a difference of illuminance between the hot and
cold « Bubble » Led.
However how can we increase our lumens values ?
To do this we added to our assembly a fan powered by 12V and placed near the support of
the led.

Here are the results obtained for the same leds placed at the same disctance from the wall.

p. 33

Cold « bubble » Led with fan
radius(cm)
lux
lumen
0 2750
0,00
5 1800
14,13
10
546
12,8583
15
195
7,65375
20
71
3,90145
25
43
3,03795
30
26
2,2451
35
16
1,6328
40
12
1,413
45
8
1,0676
50
6
0,8949

power

total

1

48,83

lumen/watt

48,83

We gained about 6 lumens with the fan.
Graphic representing lumens according to the radius with fan

16,00

Cold bubble Led lumens with fan

14,00
12,00

lumen

10,00
8,00
6,00
Lumens

4,00
2,00
0,00
0

10

20

30

40

50

60

Radius (cm)

The temperature of the LED is at room temperature up to 0.3 A the nit reaches 58 ° C, which
is less compared to the first measure.

p. 34

Voltage
3V
Current
0,1
0,2
0,3
Lux 10cm
1005
1760
2420
T°C
24
28
31
Follows the measurements of the hot LED with fan.
Hot « bubble » Led with fan
radius(cm)
lux
lumen
0 3070
0,00
5 2030
15,9355
10
650
15,3075
15
260
10,205
20
115
6,31925
25
55
3,88575
30
35
3,02225
35
20
2,041
40
15
1,76625
45
9
1,20105
50
7
1,04405

0,4
2730
48

0,5
3190
58

power

total

60,73

1

lumen/watt

60,73

We gained 4 lumens compared to the last measure.
Graphic representing lumens according to the radius with fan
18,00

Hot bubble Led lumens with fan

16,00
14,00
12,00

lumen

10,00
8,00
6,00

Lumens

4,00
2,00
0,00
0

10

20

30

40

50

60

Radius (cm)

The temperature is lowered and the illuminance increased at each level.

p. 35

Voltage
Current
Lux 10cm
T°C

0,1
970
21

0,2
1880
26

3V
0,3
2640
32

0,4
3120
34

0,5
3950
40

Conclusion, case study of leds bubbles
The decrease in the temperature of the LED is therefore a way to increase
the illumination and the lumen rate of a led, a simple fan has allowed us to
obtain better results.
The installation of a fan on a Led could be possible, or modify the carcass of
the Led to obtain a better air circulation and thus a better performance, to
see if this is feasible from a point of view the machining of the part and the
financial profitability of such a modification.
In all cases, an air flow on the LED can increase its performance. We recall
that when the current is constant in the LED and the voltage increases, the
power also increases, which can lead to its destruction.
Cooling can remedy this.

p. 36

Database and user information
We decided, in order to disseminate our information to create a web page, divided into
several parts.

Homepage

Interface
Disconnected user

Connected user

Of course, « Good evening » and « Good morning » vary according to the time !

p. 37

Code

p. 38

Menu
Interface

We have decided to dedicate a tab for LEDs, one for batteries in order to prepare the
future of the site, as well as a forum area that will allow users to ask their questions.

Code

p. 39

p. 40

The site

Homepage

We created this website first using CSS Html languages only.
However it was found that the code became overloaded so we decided to integrate the
PHP and MySQL languages to facilitate the development of the site and manage the
information we receive from the forms in order to create a user space and a forum.
All this usng the WAMP software that groups the compilers of different languages.

Registration

p. 41

Forum space

In the first place, in order to understand how data management works, we tried to
receive user information in a file and retrieve it when it is needed.

p. 42

PHP PROGRAM FOR STORING INFORMATION IN A FILE :

Then we tried to go into database using the MySQL language but we could not store the
information directly in a database.
PROGRAM CONTAINING LINES IN MySQL FOR STORING INFORMATION IN A
DATABASE:

Information
Then, we retrieved the curves that we realized on Excel and the tables summarizing the
performances of the LEDs.

p. 43

p. 44

p. 45

Conclusion and Perspectives

To conclude, safety is acrucial issue, the state has put in place mandatory laws to
regulate mandatory bicycle lighting.
We are therefore able to determine the otpimal physical magnitudes required for this or
that use (eg lighting required to see it on a road, in a room, on a desk, etc.).
Following this project we were able to quantify these physical quantities and compare
them with each other and compare them to the minimum required for a specific use
determined in the specifications.
This required a good organization of tasks between the preliminary stydy, the
measurements and the grouping of data on a website.
Indeed the creation of a website seemed to us the best solution to publicize our results
and put the mat the serviceof the users who wish to know more about their lights.
After carrying out an upstream study we concluded that it was difficult to find a suitable
lamp for a set of specifications defined by lack of correct data.
Since we want to choose a lighting, we are faced with a multitude of data of any kind,
data that puts the user in the darkand the purchase is most often made blind.
It is this lack of clarity that we have tried to solve with this project.
In the future, this project could become much more important.
By changing our site into a real shopping guide we would then be able to refer a user
who would come to this site and who, specifying only the use he wants to make his LED,
then find all the LEDs corresponding at his request.
In addition, an English translation of the site (and other languages, why not?) Would
allow us to target the international!

p. 46

Sources

LED lighting for bike (qq mW à 15W), Maker Faire
Arnaud Sivert, Franck Betin, Bruno Vacossin, Sébastien Carriere U.P.J.V University of
Picardie Jules Verne, University Institute of Technology of Aisne, GEII, 02880 SOISSONS
Laboratory of Innovative Technologies (L.I.T), team Electrical Energy and Associated
Systems (EEAS)
https://www.futura-sciences.com/maison/definitions/maison-led-6968/
https://fr.wikipedia.org/wiki/Diode_électroluminescente
http://leclairage.fr/led/
https://www.vossloh-schwabe.com/uploads/tx_sbdownloader/Guide_des_LED_FR.pdf

p. 47


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