Residential Street Lighting

RESIDENTIAL STREET LIGHTING

Eliminate Overlighting

Why Convert to LEDs? LEDs are Twice as Efficient as Existing Street Lights

residential_optics

residential_lampLEDs provide 75% more light on the road than existing HPS lights (High Pressure Sodium) residential_qtip
LEDs stimulate our night vision residential_eye
For the Nerds

The formal name for night vision is “scotopic vision” – the vision of the eye under low light conditions. The term comes from Greek skotos meaning darkness and -opia meaning a condition of sight. In the human ete cone cells are nonfunctional in low light – scotopic vision is produced elusively through rod cells which are most sensitive to wavelengths of light around 498 nm (green-blue) and are insensitive to wavelengths longer then about 640 nm (red.)

90% of Residential Streets are Overlit

On average, residential street lights are 200% brighter than IESNA guidelines
(Illuminating Engineering Society of North America)

And sometimes as high as 400%!!

Overlighting inflates municipal energy bills and the excess light shining into bedroom windows irritates residents. It also causes light pollution and hides the night sky.
Source Data

Representative sample of 6,000 lights from 8 BC municipalities.

When energy costs and greenhouse gases weren’t a concern, highly lit streets were a source of civic pride. Those days are long gone!!

Converting Residential Lights to LEDs Saves up to 85% of Residential Street Light Energy Costs and 85-90% of Maintenance Costs

LEDs on their own save 50% of the energy cost over existing HPS lights
Our wattage reduction technology eliminates over-lighting and saves another 30%-40%
Plus maintenance savings* of $30/light/year – for 15 years!
(BC Hydro Estimate)
*Here’s why
  • LEDs last 15 years versus 5 years for an HPS bulb
  • LEDs luminaires can be spray-cleaned from the street – no cherry-picker required
  • HPS to LED Energy Savings
  • +
    Wattage Reduction
  • +
    Maintenance Savings
  • =
    BIG SAVINGS!

Typical Savings Scenario

 
Existing HPS 150W Operating Costs
New LED Operating Costs
Annual Savings
Savings Over 15 Years (Life of LED)

  • Energy Cost*/Light*
  • Maintenance Cost/Light
    (BC Hydro Estimate)
  • Total Cost/Light
  • $67.68
  • $34.50
  • $102.08
  • $10.44
  • $4.40
  • $14.84
  • $57.24
  • $30.10
  • $87.24
  • $858.60
  • $451.50
  • $1,310.10
Existing HPS 150W Operating Costs New LED Operating Costs Annual Savings Savings Over 15 Years (Life of LED)
Energy Cost*/Light* $67.68 $10.44 $57.24 $858.60
Maintenance Cost/Light (BC Hydro Estimate) $34.50 $4.40 $30.10 $451.50
Total Cost/Light $102.08 $14.84 $87.24 $1,310.10

Bottom Line
A municipality replacing 10,000 150W HPS residential lights with LEDs will save $13,000,000** over 15 years = $870,000 per year

Here’s the math

*Energy costs are calculated at the BC Hydro approved rate for street lights of $0.03 per input watt (includes HPS bulb and ballast) per month.
**$1,310 savings/light over 15 years
x 10,000 residential lights
= $13,100,000 for 15 years
= $873,333 per year

Source data

Statistical analysis of a representative sample of 6,000 lights from eight BC municipalities.