htgsupply.com or visit ebay for them..but you konw the more you spend the better the light..and i mean..the sound of it..the light output /digit gives out the most and it uses the same enery as the other one( i had a brain fart and cant think of the other one) also they send you a small hood so it doesnt reflect as good and so on..but many people have bought from there and got good products gl