Originally Posted by titoav15
what kind of ballast would you recommend? Also about the bulb, what would be a good one, I would like a light blue color to it.
What size tank do you have and how tall is it?
I run 175w Iwasaki 15k bulbs with magnetic ballasts over my 125. The only issue I have is with 175w bulbs, there isn't a big choice in high PAR bulbs. The bulbs I use are high a PAR (higher than many 250w bulbs), very white with a slight hint of blue. If you like a bluer look, you probably won't like these bulbs.
For a bigger selection of bulbs, I would go with 250w and an electronic ballast (IceCap and ARO are good, but any brand is fine...there is very little difference in performance between electronic ballasts). Radium and XM 20k are popular "blue looking" bulbs. The Blueline SPS
10k bulb looks like it has a nice white/blue color and has good PAR.
This may help. It lists the PAR (PPFD - Photosynthetic Photon Flux Density) and CCT (Correlated Color Temp) which is the actual K
temp of the bulbs as tested.
250w MH bulb performance
Originally Posted by DubJ
Really? Why would the light be better at 6 inches?
You get better light penetration with the bulbs closer to the water. The reason MH
bulbs need to be higher up is they are a point source light and a reflector is needed to spread the light around. If they were mounted closer to the water you would get a spot light affect where that doesn't happen with T5HO bulbs because they cover the lenght of the tank.