Don's bulbs rare light bulbs and lamps glossary of terms definition of: INTENSITY What is INTENSITY? The light emitted from a source. Intensity varies given the direction at which one views the source. Intensity does not vary with distance. reference for this page: INTENSITY references to this page: BEAM ANGLE, CANDLEPOWER, CENTER BEAM CANDLEPOWER, COLOR RENDERING INDEX, COLOR TEMPERATURE, FIELD ANGLE, INITIAL MAXIMUM BEAM CANDLEPOWER, LOUVER, LUMINANCE, METAL HALIDE LAMP