LED Luminaries

LED news and insight from our technology editor Steve Bush, who has been messing with LED lighting for more years than he would care to remember.

Citizen announces v2 of its CoB LEDs

08may13CitizenCoBv2 314Claiming up to 33% more light out, and higher efficacy, Citizen has announced version 2 of its chip-on-board LED arrays.

“Luminous flux and luminous efficacy are improved by 15-33 % and 15-38 %up to 33 % and 38 % respectively and luminous flux of 20,190 lm is achieved,” said the firm, sighting “enhancement of light extraction, and reselection of dice and materials” as the reason.

For example:

Old model (CLL050-1825A1) = 8,160 lm 99 lm/W, 4,000K
New model (CLL052-1825A5) = 10,850 lm 137 lm/W, 4,000K

There are five packages sizes (9.5×9.5 to 38×38 (all 1.4 thick)) and 11 types (64 models in total including colour variations), with outputs from 100 to 20,190 lm (0.8 to 170W).

“Only five LED packages can cover luminous flux of conventional light sources, from a 10W bulb to a 300W mercury lamp,” said Citizen. “The new products are compliant with 3-Step MacAdam ellipses chromaticity control. Chromaticity variations of LEDs are rarely noticed, excluding the 5,000K, Ra65 type.”

Mass production is scheduled to start in May 2013.

Like another recently introduced CoB range, these are chip-on-aluminium rather than chip-on-ceramic devices.

The firm now has a selection tool on its website.

Tags: aluminium, citizen, lm 137, macadam, mercury lamp

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