I recently setup 4 55watt 21" PC's in my Reef tank, and added 2 fans for air movement too cool off the ballasts and just get a little more air around the bulbs...
Easiest thing to do is to go to a lighting store, and ask for a workhorse 5 and 2 straight pin sockets. You can also get 55watt 10k bulbs from lighting stores for around $10 a piece... or if you're in calgary, I could sell you a few of my spares.
You'll then have to go to homedepot or equivalent and buy all the wires, caps, and wall plugs. It can be quite intimidating at first, but its really simple. took me 2 hours from start to finish to have great lights for less than $200.
However, if i choose to do it again, i'd just buy a used coralife system here in town...
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