From the MAKE Flickr pool

Another interesting project from Flickr member jiskar – he’s developing a high-power LED light with adjustable color temperature.

The goal of this project is to develop an energy efficient lighting system that not only produces light, but that produces light with a color and spectrum that actually has a positive influence one one’s biological and mental state. Just like sunlight.
Humans reacts on the different colors and intensities of sunlight. It influences one’s biological clock by making feel awake or sleepy, it influences productivity and mood. A lot of research has been done on this topic and it shows that lighting can have significant impact on one’s state. You probably notice this yourself; when you’re working its nice to have bright white light and when you’re relaxing you like a cozy yellow light more.

Of course those high power LEDs produce a fair amount of heat, hence the impressive heat sink –


The current iteration mixes the four LEDs via an ATTiny44’s PWM outputs. Should be interesting to see how this one turns out – if nothing else, it’ll make one heckuva custom desk lamp. Follow his progress on the Ledmodule wiki page.