Is the 'photo meter' you refer to just another name for a 'light meter' or are they two separate things? Maybe I need a different tool? What tool could I use to measure 'how bright' a CRT TV is vs. my front projection screen? Does the fact that one is direct and one is reflected mean I need two different meters? I have a radio shack 'spl meter' to tell me 'how loud' I listen to music, I'm just looking for the analogous meters for a front projection display.