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Optical Part
How Large Can Color Variations be for Acceptable Use?
Are There Color Variations Among LEDs?
Do All LEDs Have the Same Lumen Maintenance Characteristics?
What is the Life of LEDs?
Does Higher Luminous Intensity Mean Higher Light Output?
Are LEDs Inherently Directional Light Sources?
Are LEDs Available in Different Beam Distributions?
How Much Light Do LEDs Produce?

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