My friend has done an almost succesful modification, but it leaks a little light. The only time I need to use a white lense is on a long slip and you don't need to take off the red filter untill the dog is running, so you just need a bit practice at taking off the filter without losing track of your quarry, saying that I do tend to drop my filter a bit .
Edited to say the Clulite has the best action filter but the lamp has a wide beam.