Simply put, lumen efficacy is what drives energy savings, and therefore cost savings for light bulbs. Measured in lumens per watt, lumen efficacy is a figure of merit, which details how much light you receive for each watt of energy consumed.
One watt from an incandescent bulb only provides 17 lumens. 90% of the electricity used by an incandescent bulb turns into heat instead of light.
CFL bulbs are more efficient, with up to 72 lumens per watt. However, CFL bulbs require the use of toxic mercury to obtain high efficacies.
LED lighting raises the bar by achieving higher lumen efficacies while eliminating the use of toxic materials.
The True Cost of Light Bulbs
There's more to the cost of a light bulb than just its sticker price. When shopping for light bulbs its important to remember they come with another price tag – electricity. When an uninformed buyer sees two light bulbs, one for $10 (CFL PAR30) and the other for $50 (TAM Energy LED PAR30, he or she may initially reach for the $10 bulb. However, an informed buyer would take a second look and actually save money in the long run with the $50 bulb.
Key to Saving Money – Efficiency (what is lumens?)
How is it that a bulb which costs more initially, can save money over time? Efficiency. Light bulbs turn electricity into light. The way they do so varies with the technology. Approximately 90% of the power consumed by an incandescent bulb turns into heat, not light. The measure of efficiency is lumens per watt.
Imagine a light bulb that lasts so long you won't remember the last time you replaced it. TAM Energy supplies only the best of lighting that can last up to 50,000 hours. That's 17 years if you run your bulb 8 hours a day, every day. (24 hours a day - 5 years 255 days) A long rated life means less trips to the store, less money spent on new lamps, less hassle replacing high and hard to reach sockets, and. less time spent in the dark.