What size led hydroponics light do i need?

That is a hard question to answer without a little more information. Based off of the dimensions you have given, I would say ~800 watts of HPS lighting. However, there are a lot of other factors to consider to make an informed choice. Read over the link in my signature, that will give you some of the basic information you are looking for and assist us by give you a little more knowledge on what questions to ask to help us help you.
 
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