Lighting terms/abbreviations?

[reef dude]

what do all these lighting abbreviations stand for? VHO? MH? PC? etc..........
I have a 90 gallon tank and i am going to buy 4 plain old flourescent tube lights except 2 are actinic 03 and 2 will be 50/50 bulbs, is that good enough for a reef tank?

 

[lettheirberock]

NO= normal output
HO= high output
VHO= very high output
MH= metal halide
PC= power compact
hope this helps!