How to build a 250 watt HPS with Cool tube

Hey everyone I'm new to growing using the HPS lights .. I was wondering if there was any way to construct my own 250 watt HPS bulb and cool tube from just going to like my local hardware store .. Thanks for the feedback

check the do it yourself forum...there are a couple threads there

thanks that helped a lot.. another question.. do you need to have a ballast with a HPS bulb or is there any way you can do it without

yes you need one