Trying to find LEDs that produce heat

Does anyone know of an addressable matrix that produces a lot of heat per pixel.

We manufacture Shadow Shifter which is a heat reactive t-shirt and we want to demonstrate the color change by placing an LED matrix behind the fabric and when we send an image to the matrix it needs to produce a lot of heat to make the fabric change color.

None of the matrix boards ever specify the heat produced by the LEDs so the only way I can find out is from your knowledge.

Any help would be great and you can see how the t-shirt works at shadowshifter.us .

Shadow_Shifter_box_blue_boy_thumb.jpg

Does anyone know of an addressable matrix that produces a lot of heat per pixel.

No such thing exists. By their nature an LED matrix is meant for looking at and if you used any high power LED that used enough current to generate a reasonable amount of heat then it would be too bright to look at directly.

Replacing the LEDs with resistors might work but forget about addressable and use a conventional column and row matrix. And make sure the drivers can handle the current.

if you look in the Datasheets of the Canadian RGB modules that light up the Horseshoe Falls at the US/Canadien Boarder they got a deicing LED system 27W DMX controlled for selling