Canreef Jeopardy! Game One - Sponsored by Canada Corals

[Samw]

Originally Posted by StirCrazy

going to have to deduct these points, the proper answer should be

what is a HID light.

Steve

But I think only MH is used in home aquaria and hydroponics. Xenon and regular Mecury vapor for example would not be suitable for those applications. So "what is HID" would be too broad of a question for the clue.