After brightness dimming, tunable color temperature is a feature that allows end users to tune the warmth of the light they receive. Typically, this feature is implemented through the use of multiple LEDs binned from cool white to warm white, behind a diffuser.

With its CHI3030 27V/29W series, Everlight claims to have a very compact solution, with LEDs packaged behind concentric layers of phosphors offering different color temperatures of white. Depending on how much warm white or cool white you choose to light up, you can get a precise color-temperature mix.

A multichip solution, the CHI3030 is the largest such color-temperature tunable COB LED, measuring 30 x 30 mm and drawing 29 W at 27 V. It is available with many different tunable ranges, from 2,580-5,700K for the KH Warm White series to a tunable range of 4,745-7,050K for the KT Cool-White series, with typical luminous flux of 2,760 lm for a 2,700K warm white to 2,990 lm for a 5,700K cool white. Smaller series are also available with fewer concentric phosphor rings and operating down to 9 W.

According to Christopher Keusch, director of lighting business for EMEA at Everlight, such color-temperature tunable LEDs will become mainstream within the next few years, adding extra tuning flexibility while making it easy for luminaire manufacturers to calibrate their products precisely at a fairly low cost.

Everlight is also keen to play in the increasingly popular filament LED market, where strips of LEDs lined up in series are coated in phosphor, to be implemented into traditional-looking filament lightbulbs. The company exhibited several such filament LEDs ready for integration by LED bulb manufacturers.

This article was previously published on EE Times Europe.