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Aah, but the REAL question is: which co$t$ more, electricity for the lighting or electricity/gas/oil for heating?
If electricity is less costly (as I think it is), then lights can be beneficial for reducing heat loss, but certainly NOT useful for creating enough heat to offset outside cold.
Here, in ariz-zona, where summer A/C isn't cheap, I religously turn OFF anything that's not absolutely needed...or actually IN USE.
...and, I've found that LED lamps are slightly more efficient (9W vs. 14W for 800-Lumen, 5K lamps) than CFL's at power consumption, but vastly better at survivability when installed pointing downward. CFL's tend to "cook" their electronics when oriented base-UP/globe-DOWN...causing their electronics to "cook" and fail WAY too often. Hence, we've switched to LED's.
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