Richard Comerford
Designed to be driven from rectified ac voltage rather than a constant dc current source like most other LEDs, the high-voltage emitter Philips Luxeon H LED aims to simplify design of SSL replacements for candelabra bulbs or other small form-factor lamps. A pair of LEDs need only a bridge rectifier IC and resistor to work directly from a 120- or 240-V ac mains, producing about as much light as a 15-W incandescent.
The 120-viewing-angle LED is available in two warm-white color temperatures, 2,700K and 3,000K, with typical flux of 84 and 90 lm, respectively, efficacies of approximately 60 lm/W, and typical CRIs of 83. Maximum junction temperature is 125°C and, in keeping with use in space-constrained designs, the LEDs can provide high output over a case temperature range of 40 to 105°C. The units are said to be highly color stable over their lifetimes, and will deliver, on average, 70% lumen maintenance (L70) at 25,000 hours of operation with a forward current up to 30 mA.
Typical Luxeon H application circuit:
The LED is identical in footprint (approximately 3 x 4.5 mm) to Luxeon Rebel and Luxeon Rebel ES LEDs to further simplifying implementation. ($1.20 ea / large qty — available now.)
