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Cool Daylight ≈75 6500 800-series rare-earth tri-phosphor tubes Japanese Color Code Numeric color code Color Approximate CRI Color temperature (K) ELX 825 Sunset White ≈85 2500 ELR, ELC 827, 828 Extra Warm white ≈85 2700, 2800 EX-L, EL, ELK 830 Warm White ≈85 3000 ELW 832 Warm White ≈85 3200 EX-WW, EWW 835 Neutral White ≈85 3500 EW38
Available in numerous spot and flood beam spreads. Like all light bulbs, the number represents the diameter of the bulb in 1 ⁄ 8 of an inch. Therefore, a PAR 16 is 51 mm (2 in) in diameter, a PAR 20 is 64 mm (2.5 in) in diameter, PAR 30 is 95 mm (3.75 in) and a PAR 38 is 121 mm (4.75 in) in diameter. A package of four 60-watt light bulbs
In 1895 Daniel McFarlan Moore demonstrated lamps 2 to 3 meters (6.6 to 9.8 ft) in length that used carbon dioxide or nitrogen to emit white or pink light, respectively. They were considerably more complicated than an incandescent bulb, requiring both a high-voltage power supply and a pressure-regulating system for the fill gas. [7] Peter Cooper ...
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Good quality consumer CFLs use three or four phosphors to achieve a "white" light with a color rendering index (CRI) of about 80, where the maximum 100 represents the appearance of colors under daylight or other sources of black-body radiation such as an incandescent light bulb (depending on the correlated color temperature).