How do I know which diffusing angle works for my application?

Holographic Diffuser Selection Guide
Reduce Speckle	0.5°, 1°, 0.2° x 40°
Minimize Glare	5°, 10°, 15°, 5° x 30°
General Lighting	15°, 20°, 25°, 30°, 40°, 60°, 80°, 5° x 30°, 10° x 60°
Short Distance Homogenizaion	60°, 80°
Display Screen	60°, 80°, 1° x 60°, 10° x 60°

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Holographic Diffuser Selection Guide
Application Need	Recommended Diffusing Angle
Reduce Speckle	0.5°, 1°, 0.2° x 40°
Minimize Glare	5°, 10°, 15°, 5° x 30°
General Lighting	15°, 20°, 25°, 30°, 40°, 60°, 80°, 5° x 30°, 10° x 60°
Short Distance Homogenizaion	60°, 80°
Display Screen	60°, 80°, 1° x 60°, 10° x 60°