Okay, besides American Science and Surplus, this is my new favorite site
From reading the website, i found out i’m throwing IR blobs on my screen from my projector.. I know I need to get a hot mirror, but I found these....
3” DIAMETER INFRARED HEAT ABSORBING GLASS
Made by Corning Glass Works this is 3” diameter by 3/16” thick infrared heat absorbing glass. Heat absorbing glass is used to reduce the amount of heat transmitted through an optical system. Heat absorbing glass effectively absorbs wavelengths beyond the visible spectrum. Unlike a hot mirror, which reflects the infrared wavelengths, the heat absorbing glass absorbs the infrared radiation and then dissipates the heat into the air around the glass. Heat absorbing glass can also be utilized as a shortpass filter, in order to pass the visible and block the IR. It has a ruby red coating.
I also found throwing mirrors on there too.. from someone elses post on the site. Very kewl stuff :D
for 2 lens, and 2 mirrors, my shipping was 5 bucks.