Has anyone have any experience with these 720w bar LED lights that run of a digital MH/HPS ballast? There quite inexpensive, costing from £250 to £399. Some come with the cheap dimmable ballast and some you can use any digital HPS ballast, lumii black is one i see the most , but i've seen 4-5 different ones now. Please let me know if anyone has taken the plunge as 720w for that price is a steal. But who stealing??? Any info would be good.