Beam Spread – Angle
The Beam spread is the angle between two directions for which the intensity of at least 50% is obtained to the maximum intensity (i.e Halogen Bulbs) of the light bulb as measured in a plane through the nominal beam center line.
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American National Standards Institute Ampere Ballast Ansi ANSI Code Arc Length ballast ballast BEF ballast btl Ballast Efficacy Factor Ballast Factor ballasts BD Beam Angle Beam Spread BEF BF BTL BU bulb ballast Bulb Base bulbs Burn Position HID Burn Position Lamps Cold Start Bulbs HPS Metal halide HID Color Rendering Constant wattage Transformer core and coil ballast CRI CWA electrical ballasts Electronic Ballasts HPS Hybrid Ballast inefficient ballast lamp Lamp Base light ballast light bulb Light Bulb Base magentic ballast magnetic ballast Medium Socket Mogul Socket Ra Univeral