Types of metal halide?

[zippy]

I'm just starting some research and was wondering a few things. What is the difference between a standard and a mogul base? What is the difference between a German and a Coralife bulb with the same color temp? Finally, if I want to put corals on just 1 side of my 4' tank, can I just use 1 light, or do I need to flood the whole area with 2? Thanks.

 

[ironreef]

standard/mogul are the same. Hqi runs 10-20k mv runs 6.5. I will send you some links if you want. it will help you better.