CooLED - a new generation LED light source for the timeless high-end market.

The project aims to develop and demonstrate an optical flexible LED bulb using the energy efficient

technology of LEDs optimally when applying it to the timeless exclusive classical lamps such as the PH5

by Poul Henningsen, the Flowerpot and the Globe by Verner Panton, and the Artichoke by Poul

Henningsen, etc. When inserting LED light sources in these lamps most of the energy is deposited in the

lamps’ shade units due to the way the light source emits its light.

The new LED bulbs on the market are all based on LED technology and are significantly more energy

efficient compared to their predecessor, the incandescent light bulb, however the optical part is based on a

one-size-fits all approach which is less desirable from and energy efficiency perspective. The outcome of

this project will settle with the increase of light sources by introducing an optically flexible retrofit LED

solution. By applying low cost, tailored lenses that are interchangeable this solution could give the light a

geometrical suitability for the application at hand.

The LED light bulb solution CooLED, developed and patented by AT-Lighting is outlined above with the

interchangeable lenses to the right of the bulb. One of the main activities in this project will be designing

the optical units based on an optical ray trace modeling done by DTU Fotonik in an iterative process with

testing solutions in physical model systems in an agile management process adapted to the structure of

the project.

The LEDs in the CooLED bulb are placed on an individually patented cooling profile enabling efficient usage

of a chimney effect, creating a powerful air flow in the center of the unit emitting the heat from the LED.

The advantage of the CooLED is that the heat sensible and heat emitting elements do not reduce each

other’s durability as seen in traditional light sources in where the transformer print is placed in the central

axis of the light source. To implement this geometrical construction it is necessary to reduce the

transformer unit to make it fit into the socket. The company Noliac has the expertise of developing

piezoelectrical transformer units converting 40 W/cm2 with 98 % efficiency, thereby enabling the

implementation of a very small print as transformer unit meeting the geometrical demands. This can be

assembled with components to achieve longevity only limited by the lifespan of the LEDs and not the

electronics.

The CooLED address the market for retrofit LED light sources that are optically tailored for timeless icon

lamps impacting sales in particular the maintenance market in many years to come, This is a niche

market which no one seems to offer custom solutions for today. The additional sales charge of 20-30 % for

the CooLED solution is profited in energy savings. By directing the light correctly out through the lamp

shade it is possible to gain up to 90 % in energy reduction thus minimizing changing the light source due

to the improved longevity.