Posts tagged “LED”
I’ve recently discovered the reasonably priced LED shop light. “Big whoop” you may be thinking. It’s a bigger whoop than many realize, especially for me. Just for the fun of it, I measured the current draw of one of my old shop lights and one of the new LED versions. The LED lights use 66% less energy. This won’t make a meaningful, or possibly even a measurable difference in my electric bill but to put this into perspective, if you could achieve that level of efficiency improvement for all lighting in the country, from a CO2 emission perspective, it would be roughly equivalent to replacing about 7% of our fossil fuel power plants with renewable green lower CO2 emitting electrical energy sources, without having to build a single nuclear, wind, hydro, or solar power plant. That’s more than today’s total for wind and solar combined. Put yet another way, that is equivalent to about 1,000 utility scale wind projects (48,000 wind turbines), or about 36 nuclear power plants. But before you toss back that shot of whiskey in celebration, understand that the 66% reduction I achieved with my shop lights would not apply to all lighting across the country.
Just last year the Nobel Prize was awarded to the three Japanese scientists responsible for creating the version of diodes that is used for lighting today.
The only downsides of note I found (and I’m sure there are more) are the fact that insects are more attracted to diode lights and that they don’t generate enough heat to melt the snow when used as traffic lights (easily resolved by not using diodes). The insect problem appears to be potentially serious because insects are the key to nature’s food webs and I would hope that laws could be made to minimize their use outdoors where that is a concern.
When it comes to energy efficiency, retailers are on a roll. Convenience store chain Wawa announced last year that it saves over $1 million a year in energy costs thanks to an LED lighting retrofit. Nationwide department store Kohl’s saved $50 million in energy costs over four years and has continued to improve its energy performance with lighting and energy management systems upgrades. As a result, Kohl’s claims, “we have one of the lowest energy usages per square foot in the retail industry.”
Walgreens, the country’s largest drugstore chain, recently completed lighting retrofits at 80% of its locations nationwide. The company said this change not only saves money, but also improves the customer experience: “Colors appear more vibrant and more like they would in daylight, so customers don’t need to second guess themselves in the cosmetics aisle.”
For retailers like these, energy efficiency offers an edge over their competitors. It’s about the bottom line, pure and simple.