easy rendering for Rhino in Windows
You can tag the objects as a light. I would recommend tagging the LEDs as a spotlight. I would also put the lights on a separate channel. This allows you to adjust the strength of the light on the fly.
There are a number of discussion on this: http://nxt.flamingo3d.com/forum/topics/making-an-item-back-lit-or-g...
But, I normally use this method to create LED materials.
Product Materials and Lights Tutorial.
Then I might add a little glare post process to get the halo: