Conversion bulb...MH to HPS...

I was looking around comparing prices for a conversion bulb to use on my 400w metal halide ballast. Convert metal halide to hps lighting. Can anyone recommend an online shop that is reliable and good pricing? Most of the conversion bulbs Iâ??ve seen are in the $80-$90 range. I came across Red Burning, High Kelvin Metal Halide Lamps For Budding/ Flowering at this website http://dansgardenshop.com/redburhigkel.html They run around $70 has anyone used one of these lamps and how were they? Thanks...peace...

i get mine from discounthydro.com

Thanks for the tip del...I just checked the prices and they are about $10 cheaper than 4 other sites I looked at today...peace... :)