Metal Halide positioning
I just put up a clamp-on 150W HQI Metal Halide light on my 45 gallon hexagon tank, with the intentions to add some corals once water parameters are right.
What is the closest I can keep the light from the surface of the water? Currently it is about 8 inches up. I ask for two varying reasons: (1) I'm worried about the heat from the bulb; and (2) that light is so bright, it's almost distracting as it lights up nearly my entire apartment and does blind the eyes when closely viewing the tank.
Any advice is appreciated!