I bought a replacement lamp for my optoma hd80 a few months ago and the picture quality has been terrible. lots of hot spots, contrast way off etc...So I need a new lamp. B&H photo has a replacement lamp for 400.00! Pureland supply has the same model number lamp at 186.70. I need help understanding the diffence, if any. (I understand the difference in price by the way), so, I don't want to buy an inferior lamp again. BL-FS300B FOR OPLEP910 Please help!!