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I saw this topic and thought I might try to add some hard numbers to performance of Da-Lite's HC Da-Mat fabric. Here is what an independent source found as a result of testing for color shift and luminance values. The method for testing was to try a recreate a real live scenario. This is what was determined.
"First, we took readings from the projection system using a 1.0 gain white screen as our base.
With a 100 IRE Window being projected, we had 9.46 foot lamberts and an X value of 334 and a Y value of 351 (color coordinates).
With a 40 IRE window projected, the values were: 1.39 foot lamberts, an X value of 317 and a Y value of 323.
We then took the 0.8 gain HC Da-Mat and put it into the exact same configuration (nothing was changed).
With a 100 IRE window projected we had 6.13 foot lamberts, an X value of 338 and a Y value of 353.
With the 40 IRE window, we had 0.88 foot lamberts, a X value of 322 and a Y value of 323."
So as you can see from this small test, the HC Da-Mat has very little color shift. What we intended for this fabric to do is to lower black levels and shift the grey scale of the image. We did not want to affect the colors.
Blake Brubaker, CTS
Vice President of Sales
Da-Lite Screen Company, Inc.