LEDs run on HV to simplify designs, cut replacement-bulb costs
Typically operating at 46 V, the high-voltage XLamp XT-E and XM-L LEDs enable the use of more efficient, smaller drivers to lower cost for compact lighting applications such as candelabra and other small retrofit LED lamps. Both units deliver more light at higher efficacies than their nearest competitors.
The 3,000K (warm-white) version XT-E easily delivers 200 lm, equivalent to a 25-W candelabra bulb, with an efficacy of about 65 lm/W; it’s nearest competitor can only deliver 150 lm and at roughly two-thirds XT-E’s efficacy. The XM-L has a 6-W maximum rating and delivers almost 500 lm at 3,000K. Coupled with the ability to deliver high output, both the XT-E and XM-L are extremely small (3.5 x 3.5 and 5 x 5 mm, respectively), making design of small bulbs that fit desired form factors much easier.
In unoptimized demo bulbs, an XT-E based system delivered up to 50 lm/W while an XM-L-based bulb delivered 57 lm/W. In systems, use of the bulbs can minimize current through the LED driver’s output rectifier, which reduces power loss and reduces heat dissipation in the driver, thus increasing the system’s luminous efficacy. Overall, a typical driver can end up being 15% smaller, 10 to 20% more efficient, 10% cheaper, and operate at a 10% lower temperature.
Running at 85°C, the XM-L LED delivers up to 600 lm at 6,000K (cool white) and up to 462 lm at 3,000K (warm white) at 6 W; the XT-E, 300 lm at 6,000K and 228 lm at 3,000K at 3 W. (Less than $1.50 ea / prod qty — available now in prod qty.)
By Richard Comerford
Cree , Durham , NC
Sales 919-313-5300
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