Why do big name brands like Epson specifically say not to ceiling mount ultra short throw projectors with ALR and CLR screens? I tested the two best performing screens from my projector screen showdown to see how they would handle a ceiling mounted UST projector in various lighting conditions.

🔥UST Mount 🔥
NC Projector Wall Mount: https://amzn.to/3ySxE1y

🔥Screens🔥
Formovie ALR: https://www.projectorscreen.com/formovie-fresnel-alr-ultra-short-throw-projector-screen-100-inch-ust?af=hookup-af
Spectra CLR: https://www.projectorscreen.com/spectra-projection-vantage-100-ust-alr-clr-projector-screen-for-ultra-short-throw-projectors.html?af=hookup-af

🔥Projectors🔥
Nexigo PJ90 Aurora: https://amzn.to/3LDG5Fs
AWOL LTV-3500: https://amzn.to/3ltd8kX

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Music by www.BenSound.com
00:00 Introduction
00:32 ALR vs CLR Screen Intro
01:27 Ambient Light Testing
04:53 Testing Conclusions
06:07 Ceiling Mount Pros and Cons
09:26 Summary