I'm looking for that colored cellophane stuff that's used on a flash unit. I've seen them used and I've read about them here on Photo.net. They're called gels. But when I look for colored gels on the B&H site, I come up with wratten gel filters or these colored gel squares: http://www.bhphotovideo.com/bnh/controller/home? O=productlist&A=details&Q=&sku=38220&is=REG These aren't the same thing, are they? If not, can someone point me to the right thing on B&H...or somewhere else?