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Checks out (with unit analysis)

36W/1000 = 0.036 KW
0.036KW * 12 hr/day * 28 days = 12.096 Kwh
12.096Kwh * $0.144$/Kwh = $1.74
You need to factor in the filter (24hr/day) a heater (?hr/day) etc but the difference between a 15W and 36W lamp is not the sole factor in your increased bill.

I am still looking for a kill-a-watt to measure actual power consumption but I doubt that it is as bad as CSF's approximation. (Ie the advance 4X 32W T8 draws ~8W with no bulb connected)
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