A CLF bulb (the twisty one above) is done is true wattage and equivalent wattage. You can put a true 40w CLF which would be equivalent to a 100w (give or take) in that lamp and be ok, it would also be a lot cooler as well. I have found CLF not only save energy but run cooler which means they dry your paints out less as well.
I recommend buying a normal lamp from your local shop and buying a OTTLITE bulb to go in it. They are pricey (I think mine was $15ish) but when you toss it in a 20 dollar lamp (which is a pretty nice lamp) you get an OTTLITE for 30-35, it is what I did.
Yep, it's like you put a normal 40W bulb in there, the reason the less wattage ones put more light out is because of how well they work. Putting a 40W CFL in there is like putting a normal 40W bulb in terms of power draw, it just puts out more light.
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