Science Questions

How does energy consumption of fluorescent light bulbs differ?

Sun, 16th Jan 2011

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John, Wollaston asked:

How does the energy use in the new, more efficient energy-saving bulbs compare with older lamp designs of say, 100 watts?


Dave -  The efficacy of a light bulb is a measure of how much visible light they produce per watt.  So, an old fashioned fluorescent is somewhere between 50 and 67 lumens per watt whereas a compact fluorescent is between 60 and 72.  So it's similar, but possibly slightly better because the compact fluorescents are newer.


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