VHO Lighting: Very High Output fluorescent lighting. These lights are powered by special ballast which deliver a wide spectra light.
VHO lighting is the older of the two fluorescent technologies. This has its good points as well as it down sides. VHO is comparable in size to the stand flouresent strip lights one would see in a warehouse.
VHO Lighting: Very high output (VHO) fluorescents pack much more lighting power. A standard 4-foot VHO bulb is 110 watts. Special fixtures and ballasts are needed to run these lamps. They work well on tanks up to about 18 inches deep.
If you are going to try your hand at a reef tank containing primarily mushroom anemones and soft corals, VHO lighting, even in a deeper tank, may be sufficient (although CF or MH lighting would be even better).
I have grown Riccia in my tank under VHO lighting and CO2. They flourish and I was constantly having to divide the patches and tie them down to new stones.
Another advantage to using VHO lighting is that they generate less heat as compared to Metal Halides. VHO bulbs generally will need to be replaced about every six months, or as according to the manufacturers recommendation.
My tank is set up so that one circuit handles both halides and the sump return pump, and a second circuit handles the VHO lighting and the rest of the electrical equipment.
Others swear by CO2 injection, or VHO lighting, or substrate heating, or laterite. If you made it this far, you're probably one of those folks that just can't learn enough about this stuff. :-) Use your Web browser to check out the aquatic plants ...
VHO (Very High Output) Lighting: Very High Output fluorescent bulbs have a much higher output than NO bulbs. They require a special ballast and end caps. VHO lighting is used mostly on freshwater plant tanks or marine reef tanks.
 See also: Lighting, VHO, Fish, Water, Aquarium
  
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