I've not actually tried putting on a filter on the front, but from using the 500w construction lights I find that the image has more orange than anything else, would putting on a filter balance it back out to a range of colours? or just make it more blue-er? all of the photos I took with that lamp had to be black and white, because there was nowhere enough colour information in there, white balancing on the computer afterwards didn't make much difference.

I may have a daylight filter in my stash of filters, so could give it a try, but blew up the construction lamp heh, will have to get another of those