The 'white' of white LEDs comes from the narrow-band blue naturally emitted by GaN LEDs, plus a broad spectrum yellow generated by a phosphor coating on the die which absorbs a proportion of the blue and converts it to yellow.
'GaN' die are actually InGaN heterostructures, which can produce operational wavelengths from green to ultra-violet by varying the relative amounts of indium and gallium during production.
Although this blue die + yellow phosphor approach yields light which appears white, it has little green and almost no red content leading to inferior colour rendering compared with incandescent bulbs and even 'tri-phosphor' florescent tubes. 'Warm white' LEDs, which include a red-producing phosphor, are an attempt to improve this situation as well as make LEDs illumination more acceptable in living spaces.
LEDtronics has the largest variety of White LEDs and LED lamps on the market from White SMT LEDs, 3mm, 5mm White LEDs, to Direct Incandescent Replacement White Based LED lamps in standard electrical bases and voltages from 6 Volts to 270 Volts. Base styles such as T1-3/4 (5mm) Midget-Flanged White based LED lamps, Telephone-Slide based White LED Lamps, T3-3/4 (9mm) Miniature based White LED lamps, 15mm DC Bayonet based White LED lamps, 15mm SC Bayonet based White LED lamps, A19, R20, PAR20, R30, S11, S14L, G30, Candelabra Screw based, Panel-Mount and MR16-style based White LED lamps. And durable White LED Torches and Flashlights.