For my vivariums I'm going a cheaper way... I use the clip on spotlight fixtures (the metal ones, 6 or 7 bucks...) and compact fluorescent bulbs. You can get up to '150W' (maybe more) in the spiral bulbs now, but if you go beyond 125 you need to use a bigger fixture (easily available and not more than a couple bucks more expensive).
Two of these on each of my tanks (15 to 29 gallons). I'm using the 23W variety (I think that is the equivalent of 100W incandescent). I think the bulbs cost around 6 dollars each, so I'm spending maybe 25 dollars per tank in lighting equipment.
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Rob's Rules:  http://littlefrogfarm.com
1) There is always room for one more orchid
2) There is always room for two more orchids
2a) See rule 1
3) When one has insufficient credit to purchase more orchids, obtain more credit
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