What is the correct Mounting Height?

Flickering is the periodic variation in light level caused by AC operation that leads to strobe effects.  In fluroscent lighting this is most common with an old lamp or when the ballast is not an electronic starter ballast.

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A measure of "surface brightness" when an observer is looking in the direction of the surface. It is measured in candelas per square meter (or per square foot) and was formerly referred to as "photometric brightness."

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Power supply voltage required for proper operation of fluorescent or HID ballast.

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The measure of electrical power equal to 1000 watts.

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A lamp resembling the color of daylight, typically with a color temperature of 5500 K to 6500K

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