liquidreamer
Aquarium Advice Activist
Just wondering what are the pros and cons of each. I noticed that the retro kits or stand alone sockets and ballasts that support Double Ended HQI are a good bit higher than Mogule.. what is the reason for this? Are the HQI bulbs a little cheaper that make the cost of operating down the road even out or something? Also I have 4x54watt T-5's (2x actinic 2x10k) on my normal dimension 75g... should I go with 2 175w or 2x250w MHs? I dont want to overfry my water/inhabitants... and, my rock work goes up really really high