What is a 2 pin Two Pin compact fluorescent lamp?

Light with only one wavelength (i.e. color) present. 

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A name for fused silica or melted sand from which many high-temperature containers are fashioned in the lighting industry. Quartz looks like glass but can withstand the high temperatures needed to contain high intensity arc discharges.

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Color Rendering IndicatorThe Color Rendering Indicator is a lamp with high color rendering which helps objects and persons illuminated to appear more true to life.

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Resistance of the cathode in a Fluorescent lamp is measured "cold" before the lamp is turned on (Rc) or "hot" after the lamp is turned on (Rh). The ratio of the hot resistance to the cold resistance is also measured (Rh/Rc).

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The angular dimension of the cone of light from reflectorized lamps (such as R and PAR types) encompassing the central part of the beam out to the angle where the intensity is 10% of maximum.

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