Depending on what you want the appearance to be, you could just get a 20 watt screw in CF bulb. Home Depot sells a 20 watt CF bulb for around $8. It is a 6500K bulb.
This is what I use on my rubbermaid fuge along with a cheap clamp on work light fixture.
HTH
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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