You just got suited up for your first dive of your vacation in St. Somewhere. You test your camera light system or SpD Dive Light one last time before taking the plunge, and you're bulb is burned out. The worst thing that can happen on a holiday dive, malfunctioning equipment and you don't have a spare bulb. Don't goon a trip without spares. Ikelite 12 volt 50w Lamp is for SPD-AA Lite, Pro VideoLite II and 3. Lamp is a great item for your Save-A-Dive Kit, a must for the serious underwater videographer or wreck/cave diver.