HD sells a 4ft plug in shop light that comes with a 2x32 watt electronic ballast. I use these on my prop tanks. They can be used tu run 2 28/32 watt PC
bulbs or 1 55 watt bulb. I have done both. The kit at HD sells for $7.95 I believe.
Here is a pic and write up. This has been discussed here in the past
*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,