IKEA Jansjo LED Modification

The Cree LEDs arrived and I've configured a Jansjo LED lamp with the CMA1306 9V 700ma 1000 lumen LED COB.

It fits nicely and only required cutting the tabs off the reflector back with pliers, and drilling out the reflector to clear the larger Cree LED COB center cluster.

Then just solder the Cree COB in place, be sure to use some thermal grease on the backside and mount the modified reflector, that's it.

The output is really bright and a beautiful white (5000K LED), not the yellowish orange 2700K of the original LED module.

Thermal seems good, I'be been running at ~350ma @~9.2 volts and the case is warm but not too hot to the touch.

Still waiting on the custom PCBs, but think this mod and the custom PCB with pulsed capability will really augment the versatile Jansjo lamps for our macro use. I also have a few other Cree LED, one of which has ~2400lumen output and should also fit the Jansjo. This will require pulsed operation tho, since the power dissipation is much too high for the tiny Jansjo case.

Best,

Jansjo LED Lamp with reflector removed

LED Module removed

Cree LED COB being stntalled

Cree COB LED installed

Edit: Just installed the ~2400 lumen Cree CMA1561 LED COB in a similar fashion, the reflector can't be used tho. Mounting required a couple small washers to "hold" the COB in place firmly against the Jansjo head base mount as shown. This LED COB extremely bright and with over 10 times the output of the standard Jansjo LED module. I can run this with about 150ma at 33.7 volts continuous (~40% output) without the case getting too hot to touch. The CMA1561 is rated at 400ma nominal at 2400 lumens, and 700ma produces ~3600 lumens. At max current of 1050ma the output is ~4800 lumens. So pulsed operation could produce peak outputs 3000~4000 lumens without much difficultly if the pulse width stays short.

Cree CMA1516 LED COB mounted to Jansjo