[Sherman Logan]

He says his 54 LED fixtures together use less electricity than a single 100-watt incandescent and account for just $2 a month on his utility bill.

If he heats with electricity this saves him no money on his electrical bill during the heating season, which is much of the year in MA. The "wasted" energy of the "less-efficient" incandescent or fluourescent bulbs is in the form of heat, which when using LEDs must be replaced by the furnace.

OTOH, the LEDs lack of waste heat saves on cooling costs as well as lighting costs during the summer.

[kingjoeyjr]

He heats with gas, and it costs much more to cool a home than to heat it. Also, heat from lights which are typically mounted high don’t do much for the overall heating system unless there are ceiling fans to bring the warm air down from the ceiling.

[Myrddin]

I heat my basement with 4 big computers and some networking gear. I used the same approach during a 3 month period in a San Diego apartment, but only 2 computers did the job fine.

Our local Home Depot and Lowe's have a few LED fixtures for sale. We use them in a few places where light is useful, but not critical. Reading lights are much better as incandescent or halogen. An LED is fine for stumbling down a hallway or in a bathroom.