LED lighting temperature refers to the hue emitted by a light bulb. Kelvin scale ranges from 2700K (warm white) to 6500K (daylight). 3000K represents warm yellow, ideal for natural light finishes. 4000K emits cool white, suitable for both residential and commercial spaces
Uses electric arc through vaporized mercury in quartz arc tube. Requires special fixtures and electrical ballast. Operates at one atmosphere pressure with 4-7 minute warm-up. Produces ultraviolet, violet and blue light
Produces light through electric arc using mercury vapor and metal halides. Contains quartz arc tube with electrodes and outer glass bulb. Operates at pressures between 4 and 20 atmospheres. Requires electrical ballast to limit arc current
Lumen (lm) measures visible light power in SI system. One lumen equals 1 candela multiplied by 1 steradian. One lux equals 1 lumen per square metre. One watt of green light produces 683 lumens
Electric lighting replaced candles and gas lights in early 20th century. Volta created first electric battery in 1799-1800. Warren de la Rue invented first electric light bulb in 1840. Edison and Swan independently developed functional incandescent lamps in 1870s. Coolidge introduced tungsten filament in 1912
15W LED luminaire with 1800 lumens and 4000K color temperature. Available in opal housing with IP66 and IK08 protection. Simple installation with optional through wiring capability. Warranty period of 3 years