Ok well here's my experience with htg... I live close to htg supply and have visited them many times...
Have had nothing but problems with their lights, almost made me quit growing... i've went through 5 lights / ballasts in 2 weeks... the old magnetic ballasts are shit... and the guy (manager) there even told me "if we sell 25 of these 5 will definately come back" wow... that makes me feel good... that 400 watt light in the pic is garbage.. now I was pleased with some stuff as well but I bought about 2,000$ worth of stuff through them and ended up taking it all back (boy were they pissed) dont believe me ? look at my link in my sig... I guess their lights have been sitting for years in storage and they are having alot of problems.. ya they dont have a problem warrantying them out but here's the catch on the warranty ... you cannot mail it in and expect anything within 3 months .. (this is what they said) you have to bring it b ack to the store and we will look at it... so... if you get a grow going and a resister blows in your ballast (like mine did 4 times) you have to take it to them so they can fix it ... but in the meantime your grow room suffers without light... just be carefull with htg... their prices are low for a reason... save up for a 400 watt "DIGITAL" or ELECTRONIC" ballast... much more reliable