When I had my greenhouse up north I had one of those high intensity, high power things (sodium?) in a hood that was on a track and had a motor so it could travel back and forth and provide light over a greater area than if it were just stationary. I still have it and have no clue why I kept it other than it was expensive and thought maybe I could sell it.
Now no one wants those things, especially me! It had a ballast that must have weighed close to 50# and it ran hotter than hell! Every time that thing came on the lights in the whole house dimmed!
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