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Energy Guides and Calculators

Edison Base Light Bulbs

Below is a cost comparison of three types of common lighting. This table compares old-fashioned incandescent bulbs to modern compact fluorescent (CFL) and Light Emitting Diode (LED). In almost all cases LED lighting will provide the lowest cost per hour of lighting. We have provided typical cost per 1000 hours of use (CP1k), but you can calculate your own number below. Lower CP1k is better! For discussion of light bulbs click here

Incandecent	Link	$/1khr	Typ. Flourescent Equivalent	Link	$/1khr	Typ. L.E.D. Equivalent	Link	$/1khr
15W	Buy Now	2.6	2W	No Product Available	0.7	1.5W	Buy Now	0.5
25W	Buy Now	3.8	4W	No Product Available	1.0	3W	Buy Now	0.7
40W	Buy Now	6.0	8W	Buy Now	1.37	7W	No Product Available	1.2
60W	Buy Now	9.0	15W	Buy Now	3.07	8W	Buy Now	2.0
75W	Buy Now	11.0	20W	Buy Now	4.26	11W	No Product Available	3.5

Calculate your own cost per 1000 hours (CP1k):

Enter the actual wattage (not the equivalent watts):

Enter the rated life of the bulb in hours:

Enter the price of the bulb in $ (remember to divide up the price if looking at a multi-pack) :

Please enter your electricity rate in $/kWh :
Note: If you are unsure what your current system efficiency is, Divide your total bill by the total kWh used for the period.

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