Thanks willard3,
Although I'm simply not sure that the lumens plays a part in the calculation at all. There are many devices that use electricity that don't put out light at all, yet energy consumption for those devices have been able to calculated. If memory serves, the calculations are determined by the watts and amp draw. Also any Resistance (Ohms) will play a part. I don't remember if voltage needs to be figured in, or if higher voltage just helps push through more amps. But bottom line, every cost calculate I have seen relays only on knowing the wattage. So with all that in mind, I just don't think that knowing the lumens plays a part in the calculation at all.
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