Yup, PDA screen protectors work great, have them on all my flashlights, eliminates the "patterns" many bulbs give and smooths out the LED patterns too. And protects the lens. Problem is, the monochrome screen protectors are the ones you really want, work far better than the ones for color screens. Haven't seen monochrome screen protectors for years when most places cleared them out. But the ones shaped to fit some discontinued color PDA should be cheap and worth a try, might need two layers, one rotated 90 degrees.