if you got a MH and an HPS you dun need hortilux.. they are designed to make up for the lack of one or the other.. sort ogf.. they also provide a slightly better spectrum than you would get with both. since i happen to have a loaned 400 watt MH i took my 1000 HPS hortilux out and put back in the old cheap one (still works) i'll use the hortilux later on