Just received the refugium nano light today from Reef Breeders. I'm happy with the design and the lighting. But, I noticed after it was on for merely 30 minutes, it was really hot to the touch. I don't have a means to measure the temperature but I can say that it is quite uncomfortable when I place my hand on top of it. Although, it probably isn't hot enough to actually burn the skin. Is this normal for these lights?