I a long time ago Used metal halide .Some guy got busted growing dope and I ended up with them.They cost to much money to run so I gave them to an iguana guy.He loved them he just had to be careful how close they were to his animals as they can cook something very quick.Now they have so many kinds that is easly avoided.I do not think they if used right would hurt anything and most likely over the next few years we will know there benifit for sure as long as people start useing them.
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Archie Bottoms