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LED lighting of Residential Areas - The economical option for Local
Authorities
By Daniel Kasper
and
Johann Schleritzko
Power consumption per km of road, to generate the required lighting levels in terms of SANS 10098, for
Class B roads, comparing different lamp sources
Pow
er r
equ
ired
, in
kW
/ k
m
Class B1 Roads
0
0.5
1
1.5
2
2.5
3
3.5
4
Class B2 Roads Class B3 Roads
HPS
HPS
HPS
LED
LED
LED
MV
MV
CFL
CFL
MH
Cost comparison, Class B1 Roads, Residential streets with medium to high volume traffic
Group, in terms of SANS 10098
100W HPS 150WMH LED 77W
Cost of luminaire, inclusive lamp R 1257.6 1325.6 3563
Energy consumption per year, based on R 0.58 per kWh R 438 682 293
Total annual lamp replacement costs R 167.4 376.7 0.0
Cost of ownership over 5 years
Initial Capital cost R 1,258 1,326 3,563
Total Energy cost R 2,191 3,410 1,467
Total Lamp Replacement Cost R 837 1,883 0
TOTAL COST OF OWNERSHIP AFTER 5YEARS R 4,286 6,619 5,030
Cost of ownership over 15 years
Initial Capital cost R 1,258 1,326 3,563
Total Energy cost R 6,573 10,231 4,401
Total Lamp Replacement Cost R 1,004 2,260 0
TOTAL COST OF OWNERSHIP AFTER 6 YEARS R 8,835 13,817 7,964
B1
Cost comparison, Class B2 Roads, Residential streets with medium volume traffic
Group, in terms of SANS 10098
70W HPS 57W CFL LED 45w
Cost of luminaire, inclusive lamp R 1197.6 1280 2680
Energy consumption per year, based on R 0.58 per kWh R 324 248 171
Total annual lamp replacement costs R 167.4 219.9 0.0
Cost of ownership over 5 years
Initial Capital cost R 1,198 1,280 2,680
Total Energy cost R 1,620 1,238 857
Total Lamp Replacement Cost R 837 1,099 0
TOTAL COST OF OWNERSHIP AFTER 5YEARS R 3,654 3,618 3,538
Cost of ownership over 15 years
Initial Capital cost R 1,198 1,280 2,680
Total Energy cost R 4,859 3,715 2,572
Total Lamp Replacement Cost R 1,004 1,319 0
TOTAL COST OF OWNERSHIP AFTER 6 YEARS R 7,060 6,315 5,252
B2
Cost comparison, Class B3 Roads, Residential streets with low volume traffic
Group, in terms of SANS 10098
70W HPS 57WCFL LED 45W
Cost of luminaire, inclusive lamp R 1197.6 1280 2680
Energy consumption per year, based on R 0.58 per kWh R 324 248 171
Total annual lamp replacement costs R 167.4 219.9 0.0
Cost of ownership over 5 years
Initial Capital cost R 1,198 1,280 2,680
Total Energy cost R 1,620 1,238 857
Total Lamp Replacement Cost R 837 1,099 0
TOTAL COST OF OWNERSHIP AFTER 5YEARS R 3,654 3,618 3,538
Cost of ownership over 15 years
Initial Capital cost R 1,198 1,280 2,680
Total Energy cost R 4,859 3,715 2,572
Total Lamp Replacement Cost R 1,004 1,319 0
TOTAL COST OF OWNERSHIP AFTER 6 YEARS R 7,060 6,315 5,252
B3
Performing Performing Performing Future Proof Future Proof Future Proof
KEY FOCUSES ON LED LUMINAIRES
Reliable Reliable Reliable
Performing Performing Performing
LED Luminous Efficiency compared to other light sources
2011: 112lm/W
LED
2015: 150lm/W
Reliability, Lifetime
Photometry with LEDs : completely different ?
The solutions to control light are different !
No …
Road Units : Lux, Cd/m², lumens, Watt, … Light distribution Norms
Same objective : Higher levels for less power with good uniformities !
Optimization of the utilization factor K
"Unusefull" light
Need to illuminate the side walks and facades !
HID islolux LED islolux
Cut-off Effect
Main Roads Luminance (A-roads)
Residential Roads Illuminance (B-roads)
Parks, Squares
Path, sea front
Future Proof Future Proof Future Proof
Upgradeable LED Engine and Electronics
Future Proof
The luminaire has to allow for on-site replacements of the photometric engine
and electronic assembly at the end of an LED’s service life, and thereby allow to integrate future innovations.
Maximum Energy Saving To utilize the increasing energy saving possibilities that LED’s and electronics will offer, the system should be upgradable whenever needed.
Serviceable Reliable Reliable Reliable
LED luminaires are part of an integrated system
Thermal
Electronic
Objective : Higher levels for less power with good uniformities.
Mechanical
• Highest quality of material.
• IP 66 rated gear compartment and photometric engine.
• Smooth Protector.
• Good thermal contact.
• LED temperature feedback.
• Optimized heat exchange surface.
• Higher lifetime than LEDs at max. ambient temperature.
• Surge protection.
• Large primary voltage range.
Photometric
Conventional Street light Local Content comparison
Imported Content: • Lamp • Ballast • Igniter • Condenser • Lamp holder
Local Content: • Housing • Protector • Clips
Local Content: • PCB (printed circuit board),
excluding the LED chip • Power Supply • Housing
Imported Content: • LED chip
LED Street light Local Content comparison
Local Content comparison,
80% local content 60% local content
Conclusion
• The time has come to apply LED street light luminaires for Class A4 and Class B applications.
• LED technology gives local companies the chance to increase the value-adding component in South Africa, increasing job creation and export opportunities.
