In 1998, international lighting Robin DuCrest founded Special FX Lighting, shortly thereafter Robin imagined and produced the first FX® Rainbow bulb. The versatility of the rainbow light is limited only by your imagination. Use them for mood lighting, party bulbs, special effects in commercial settings, and accent lighting. They are popular for porch and patio lighting, lamps, kids rooms, bedroom intimacy, wall sconces, and are also favored by message therapists, and day-spas. The bulbs are compatible in any fixture, indoor or outdoor, that is rated for 40W, 120V.