hey rootdoctor, i also bought a 400 watt hps from htg supply a little over a year ago. and i just thought id let u know that they r great people. mine worked great for about 7 months and out of nowhere started giving me trouble and i called them up and they had me send mine back and said they would replace it or repair. 6 days after sending it i had a whole new ballast reflector and bulb. and i didnt even send them the bulb i originally had back with the light. i spoke with a guy named tony and he was a great help and also told me that all of the htg supply branded ballast r warrantied for three years from date of purchase. so just know ur in good hands when buying from them. the new unit i got works great and he also told me that this new unit is under a three year warranty from the day they sent the new unit out!!! well anyway glad to hear bout ur light working and good luck on the rest of ur crops. happy growing! later