Don's bulbs rare light bulbs and lamps glossary of terms definition of: INCH What is INCH? INCH refers to CONVERSION TABLE. One inch = 25.4001 millimeters. Watts = volts x amps. Lumens = 12.57 (4 pi) x Mean spherical candlepower (MSCP). kelvin = Celsius + 273. Footcandles = candlepower / distance squared (miniature lamps only). 1 footcandle = 10.764 lux references for this page: CONVERSION TABLE, INCH, MM, MILLIMETER, MILLIMETERS references to this page: DESIGN END FOOT CANDLES, GLASS, GLOW LAMP, VOLT