[Izzy Dunne]

I did make a mistake in my version: not counting the lifetime of the bulbs. The electrical cost is still the same as I stated, I believe.

Try again:

50000 hours at 10 W = 500,000 W-hr, or 500 kWH, or $50 electric cost.
50000 hours at 14 W = 700,000 W-hr, or 700 kWH, or $70 electric cost.
50000 hours at 60 W = 3,000,000 W-hr or 3000 kWH, or $300 electric cost.

50000 hours at 50000 hr/bulb = 1 bulb @ $50 = $50
50000 hours at 10000 hr/bulb = 5 bulbs @$4 = $20
50000 hours at 1000 hr/bulb = 50 bulbs @ $0.25 = $12.50

Add the electrical cost to the purchase price and you get:
LED = $50 + $50 = $100
CFL = $70 + $20 = $90
INC = $300 + $12.50 = $312.50

I don't know about Chu, but that makes sense to me.

[nascarnation]

The bulb heat load does help in locales where there’s a heating season and of course penalizes A/C. Nobody seems to ever include that in the cost estimates.

Although there’s more daylight hours during A/C season so probably less of a penalty then.