halogen bulbs
Thanks for the refresher, I worked with halogen bulbs a long time ago, as part of a bar code reader design, but had forgotten about the recycling process that takes place internally. I realize halogen bulbs emit more light towards the blue end of the spectrum, but a significant portion of their output still falls in the IR region. That's why the bulbs burn so hot.
Another point is to be careful handling the bulbs, try not to touch the glass, and wipe off any fingerprints that accidently get on the surface or the bulb life can be shortened significantly.
I guessed the reason you couldn't just use a filter after posting, many applications have a need for the whole bulb area. I'm no expert on high-temp paints, haven't seen anything like that used on halogen lamps. Maybe something can be baked on, any lamp experts out there have some insights?