How many watts this lamp turn the input energy into light?
How many watts this lamp turn the input energy (60W) into light?
This Lamp: http://www.homedepot.com/Lighting-Fans-Light-Bulbs-Compact-Tube-Fluorescents-Tube-Fluorescents/h_d1/N-5yc1vZ1xkeZbmgdZ1z11c2hZ1z11y14/R-100613921/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
What I want is something like this:
For Example, efficiency 50% of 100 W bulb turn the electricity energy of 100 W into 50W light energy.
Subquestion: where or how to find the efficiency?
Thanks in advance.
Light output is expressed in lumens. A typical compact fluorescent lamp will give you about 60-80 lumens per watt. An incandescent lamp will give you about 15 lumens per watt. In other words, a CFL will use only about 1/4 as much electricity to give the same amount of light. More watts = more $$$.
Often you will see compact fluorescent lamps described in terms of an incandescent lamp that has a similar light output. For example a 23 watt CFL will give you the light output of a 100 watt (incandescent) lamp.
The difference in energy usage is so dramatic that there is no good reason to wait for your old incandescent light bulbs to burn out before replacing them with CFL’s.
The lamp in your link is a specialty type and is priced accordingly. Most 8 foot long T12 tubular fluorescents have a single pin at each end. At 5400 lumens and 60 watts, the efficiency of the lamp is 90 lumens per watt. That does not take into account the power wasted as heat by the ballast transformer it requires. Depending on the type of ballast used, the overall efficiency would be in the 70 – 80 lumens per watt range.
Don
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