= High Output, VHO
= Very High Output. I do believe that there is a difference in the amount of light that the put out, with VHO
being the higher of the two. These bulbs tend to last a short amount of time though which should be taken into account when pricing out replacement bulbs for different fixtures.
You might want to check out Wizard~Of~Ozz's article
. He did quite a bit of research on the differences between different lighting options and trying to find a better way of comparing them and estimated the amount of light needed to achieve different lighting levels. There's a calculator towards the bottom that will give you some estimates based on the different types of lighting.
Ultimately the choice is up to you. If you're comfortable saving some money by having the ends slightly less well lit that the rest of the aquarium, by all means that would work. Both should provide plenty of light for growing most any plant you might want.