I'd recommend 4 27W DAYLIGHT flourscent lights from Philips. They're just as cheap as if you were to buy it at Walmart and provide light in a decent spectrum. 42W bulbs are usually 'warm' within the 3000k range. Therefore, there only good for flowering.

The cost per month of a 27W bulb is $2.50 used 18/7, so you won't raise any eyebrows. Just a tip, if you ever move into a new house and plan to grow, immediately use a ton of electricity. Run useless appliances and whatnot to raise the bill to a certain level. Then we you begin to grow, turn them off and turn your lights on. No raise in electricity use