Confidential Information

Energy management Reduce overlighting

Energy saving

Operational efficiency Reduce relamping cycle

Reduce maintenance

interventions

Safety

• In road tunnel, light level is directed by

various “Recommended Practice”

• CIE 088-2004 Guide for the Lighting of Road

Tunnels and Underpasses (Europe)

• NSI/IES RP-22-11 Tunnel Lighting (North America)

• BSI BS 5489-2: Code of practice for the design of

road lighting - Part 2: Lighting of tunnels (UK)

• Other countries may have their specific

recommendations.

• The purpose is to maintain safety

driving across the tunnel to avoid the

“black hole effect” for the user.

• Main lighting design criterias are: • Tunnel type / configuration / lenght

• Degradation factor

• Traffic Speed

Energy use per tunnel system

Nyx’ approach

Large contactors to control group of

lamps

Energy Limited number of lighting

stages / lack of precision

Tunnels overlighted /

waisted energy

Design is usually performed

for the “worst case

scenario” during the day

Energy This is an average of

2845 hours of

overlighting per

year (8 hours per day)

Energy

• Combined degradation factor

Cabling

Every luminaire is hardwired to a power contactor

per lighting stage

Any change will required

major physical

installation / tunnel

closing.

Maintenance

No monitoring for lamp

failure, burn hour usage,

dirt depreciation etc.

Lack of vital information

Communication

Very limited interfacing capability

Lack of real time and

maintenance strategic

information

By controlling individually each lamp, intelligent

lighting control system can adjust dynamically to the

appropriate light level in each transition zone.

With better control of the lighting system,

owner/operator of tunnel can save substantial

energy by implementing

More lighting stage

Intelligent Light level adjustment for degradation

factor

- Energy saving

over 26 weeks

- Dynamic lumens

adjustment per

dirt accumulation

Intelligent Lighting Control System

Dynamic lighting integrated with real traffic flow

Energy saving - Overall

Intelligent Lighting Control System

Operation and maintenance Reduce relamping cycle

Dynamic lamp alternation

- reduced overlighting

- alternation of use in different stage (average it)

- activation delay

Kallang Paya Lebar Expressway (2004-2008)

12 km tunnel

13 entries / 14 exits

2 bore / 6 lane expressway

16 000 luminaires

Large saving of cables

over $ 1M value

25% reduction on energy

consumptions

Cost Energy

Cable

Installation

Maintenance Number of interventions in tunnel

Lamps life time /

extend relamping

cycle

System reliability

Safety

Operational efficiency