I'll break it down as simply as possible. The 60-watt Cree led bulb is rated 25,000 hours. Let's assume 10.8 cents/kwhr (the cost your website assumed).

• 25,000 hours * 9.5 watts * 10.8 cents/kwhr = $25.65.

To run the CFLs (I'm using the cheapest ones I could find) for 25,000 hours, using the same 10.8 cents/kwhr, would be:

• 25,000 hours * 13 watts * 10.8 cents/kwhr = $35.10

That's a difference of $9.45 cents, in electricity alone. Now, those CFL bulbs are rated for 8000 hours, so you need 3 + 1/8 of them to run for 25k hours. The cost for that many CFL bulbs is:

• $13.35 (8pack) / 8 = ~$1.67/bulb. $1.67 * (3+1/8) = $5.22

A single Cree bulb costs $8.24 per bulb (8-pack).

So where does that leave us?

TOTAL COST TO RUN CFLS FOR 25K HOURS: $35.10+$5.22 = $40.32

TOTAL COST TO RUN A SINGLE CREE LED FOR 25K HOURS: $25.65+$8.24 = $33.89.

DIFFERENCE: $6.43

Even if you get those bulbs for $1.20 a piece, the single LED is less expensive.