ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
THE ESSENTIAL ATTRIBUTES TO
LED STREETLIGHTING:
THE PROGRESSION
OF TECHNOLOGY
AND WHERE WE
CAN BENEFIT
By Daniel KASPER
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
LED’s vs. conventional lighting :
• Color recognition up to
4 times better than
conventional outdoor
lights
• No intrusive and
trespass lighting
• Everlasting lighting =>
safety and comfort
• Intelligent and dynamic
lighting
• Luminous performance
maintained along
lifecycle (70%-100%
nominal performance)
Improving
people’s life
• Reduction of CO2
emissions (up to
75%)
• Reduction of energy
consumption (up to
75%)
• Hg free
• Pay back time (2-5
years)
• Reduction of
maintenance costs
(up to 75%)
• Increased
maintenance cycles
(up to 5)
• 5 times longer
lifetime
• Luminous efficacy of
LED’s constantly going
up (beyond 100lm/W)
Taking care of
environment
Giving
optimum return
to end users
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Market prediction
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
LED luminaires are part of an integrated system
Thermal
Mechanical
Electronic
Photometric
Objective : Higher levels for less
power with good
uniformities.
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Thermal Control
 Temperature monitoring next to the
LEDs, adjusting current if over
temperature occurs
 Power Supply temperature protection
 Large surface area for optimized heat
extraction without dirt accumulation
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Africa
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Ta & Tq
• Tq: Performance Temperature:
“Ambient temperature around the luminaire related to the performance indicated of
the luminaire”
 A new notion !
• That the T° at wich the luminaire will give the residual flux after the hours of use
• This would be stated like the following: L90 60,000h @ Tq 25 °c
• What does it means ?
• A residual flux of 90% after 60,000hours of use at an operating conditions of
temperature of 25°c
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
 Lifetime at highest Tc needs to
surpass the lifetime of LEDs
 Large primary voltage range
 High surge protection required
Electronic Design
Lightning Strike
Destruction Mechanism
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
•
LED luminaires can face extreme electrical stress
conditions during the lifetime of the product.
•
Transient Voltages during Public Light Switching,
 HID Ballast Inductance switching in hybrid Installations
 Local Industrial Switching.
 Network Default Conditions.
•
Transient Voltages due to Lightning Strikes.
•
Others…
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Differential Mode Surge Mechanism.
•
Differential mode surges can damage LED as they can be induced
through the transformer by Magnetic coupling.
 They can kill the driver or the LED or both !
Heat spreader
LED Driver
PE
Mains
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Common Mode Surge Mechanism.
•
Common Mode surges can damage LEDs even without having no
effect on Drivers !
 Damage can be coming from reverse voltage breakdown.
Heat spreader
LED Driver
PE or
NPE
Mains
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Solutions for LEDLuminaires : Surge Protector
20 mm Varistors
L
L
Fuses
N
PE
N
To Driver
PE
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Programming Features
Autonomous Dimming
 Evaluation of the midnight from ON and OFF switch Time.
 Adjusted Dimming Curve over the night
 Examples : OSRAM : Astrodym ; PHILIPS : Dynadimmer
Remote Dimming




Step Dimming
Input Voltage related Dimming
DALI control
Other Interface like ZIGBEE
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Additional Features-Integrated daylight switch
Outdated layout- Photodiode integrated
outside the luminaire
New layout- Photodiode integrated
inside the luminaire
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Mechanical Design
 Highest quality of material of all
components
 IP 66 rated gear and optical
compartment
 Smooth protector
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
 Higher light levels for less power and
good uniformities
 Design flexibility and understanding
application requirements
 Long term stability
Photometric Design
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
LED Luminous Efficiency compared
to other light sources
2018: 200lm/W
2012: 150lm/W
LED
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
LED – Improved Utilization Factor
HID
White LED
100 lm/W
100 lm/W
50% utilization efficiency
Lighting efficiency 50 lm/W
70% utilization efficiency
Lighting efficiency 70 lm/W
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Solution 2 : Optimization of the utilization factor K
"Unusefull"
light

Cut-off Effect
LED islolux
Need to illuminate the side walks and
facades !
HID islolux
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID - LEDs
Lighting of a residential street
ω= 5°
Single side
installation
Two-way traffic
0.5m to1m
7-10m
2.0m
Road
Parking
2 x 3.5m
2m
2.0m
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID - LEDs
HID solution
Luminaire type BEKA LANE
Lamp type High Pressure Sodium (HPS)
HPS-T 70W
HPS-T 150W
HPS-T 250W
6600 lm
15000 lm
27500 lm
Total Power:
Total Power:
Total Power:
78W
172W
287W
Lamp type Mercury Vapour (HPMV)
HPMV 80W
HPMV 125W
3500 lm
6200 lm
Total Power:
Total Power:
Global Maintenance Factor: 0.75
92W
143W
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID - LEDs
LED solution
Luminaire type BEKA LEDlume
LED type Oslon Square
5000°K (neutral white) 140 lm/W per LED
Global maintenance factor: 0.8 (15 years)
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID - LEDs
BEKA
LANE 70W
HPS
BEKA
LEDlume
28W
BEKA
LANE 150W
HPS
BEKA
LEDlume
88W
Power (W)
78
28
172
88
Spacing (m)
50
50
40
40
Illuminance
Average(lx)
3.00
3.00
Illuminance
Minimum(lx)
1.3
0.8
0.52
0.5
Uo (%)
44
51
Ul (%)
57
67
Lav (cd/m²
W/km (W)
1560
560
4300
2200
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID - LEDs
BEKA
Strada
250W HPS
BEKA
LEDlume
116W
Power (W)
287
116
Spacing (m)
50
50
Illuminance
Average(lx)
3.00
Illuminance
Minimum(lx)
0.8
Lav (cd/m²
0.7
0.6
Uo (%)
51
51
Ul (%)
56
51
5740
2320
W/km (W)
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID 250W – LEDs 116W
R 40000.000
R 35000.000
R 30000.000
R 25000.000
BEKA Strada 250W
R 20000.000
BEKA LEDlume 116W
R 15000.000
R 10000.000
R 5000.000
R1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID 70W – LEDs 28W
R 12000.000
R 10000.000
R 8000.000
BEKA Lane 70W HPS
R 6000.000
BEKA LEDlume 28W
R 4000.000
R 2000.000
R1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID - LEDs
BEKA
LANE 80W
HPMV
BEKA
LEDlume
20W
BEKA
LANE 125W
HPMV
BEKA
LEDlume
28W
Power (W)
92
20
143
28
Spacing (m)
48
48
50
50
Illuminance
Average(lx)
2.2
2.3
4.0
3.0
Illuminance
Minimum(lx)
0.4
0.5
0.8
0.8
1916
416
Lav (cd/m²
Uo (%)
Ul (%)
W/km (W)
2860
560
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Comparison HID 125W – LEDs 28W
R 20000.000
R 18000.000
R 16000.000
R 14000.000
R 12000.000
BEKA LANE 125W HPMV
R 10000.000
BEKA LEDlume 28W
R 8000.000
R 6000.000
R 4000.000
R 2000.000
R1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING
Thank you for your attention !
ESSENTIAL ATTRIBUTES TO LED STREETLIGHTING