As you can see in the picture, one of the pits I play is right next to the stage. During blackout seques, seeing the instrument can be a challenge without additional lighting. I know AM sells white overlay stickers (permanent), but this rope light ($6 at Home Depot) works pretty well so thought I'd mention it here. It is a little warm to the touch, but definitely not hot. I got the 6' one, which is just a little longer than a 4 Octave MalletKat. When I'm not using the expanders, it doubles as a percussion table light. If it ever proves to be too bright, it is dimmable using an inline dimming extension cord ($10-15).
I had been using a Mighty Brite Duet (now on the music stand top), but the two lights just weren't illuminating enough for a 3-4 octave MK.