12v Blue LED kit for fitting to SEW ST-475 or FLASHSTAR meters to replace normal 12v lamp
SEW Meter Glow with Blue LED kit fitted
VU BLUE LED KIT Build Thread here
Photo shows blue LED kit fitted to a SEW ST-475 (Photo is more washed out that the deep blue look is in real life.)

Note. New led kits come with rectangle coloured blue leds that diffuse the light more more evenly.