VHO Question

[4ptbuck]

VHO= Very High Output
HO= High Output
NO= Normal Output

As you go up the chain, more amps are pushed through each tube.
Typically bulbs are rated for NO, HO, or VHO.
You can overdrive the bulb by using a different ballast to push more amps through.

For a standard 48" bulb

VHO=very high output 115watts
HO=high output 60watts
NO=normal 40watts

So if you hook up a 48" HO ballast to a 48" NO bulb, you are driving it 1.5X
48" VHO to 48" NO bulb 2.875 times.

Of course the possibilities are endless, but as you overdrive, things run hotter, and don't last as long.