Fluorescent Lamp efficiency?
How to find the actual energy emitted by this lamp?
I know, It requires 60 W energy input. But what is the output of the light power? (I don’t want any other additional power(heat energy,vibration, love power)) I only want how much pure light power it emit.
Thank in advance.
Here is the 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
Simpler question:
60 W is the input. What is the output of the light?
It will be less than 60W because loss in heat, vibration, and LOVE. How do I get into the number?
I want the output in Watt too.
Thank you for your answers 
Fluorescent Lamp has about 85% light efficiency. Therefore,about 50 watts electricity turns into light.
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