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Hey guys. I just acquired this lamp that I´m planning to use for a grow box. I dont really know much about it, or about ballasts at all, for that matter. Notice that one picture where markings on the lid seem to indicate that the lamp can power hps and MH bulbs in 100- 150- 250 and 400 watt...

Greetings fellow grow-entusiasts. This will be my first post, but i must warn you; I am going to get rather techinical, and being european, I use the metric system. I also have a tendansy to write very long and boring posts. Cant get the autospelling to work, so bear with me. I am currently in...