It depends -- some are, some aren't. When you shop on e-Bay, if you are thinking about buying from someone who has a normal, non-e-Bay store, be sure to check out that store's website. I bought my HPS from High Tech Garden Supply -- it is an enclosed reflector -- and I am extremely happy with it. Thing is, HTGS is a major e-Bay seller, but I was able to get my light from their website and after shipping the cost was about $25 cheaper than it would have been buying from their e-Bay listing.