High-Intensity Discharge (HID) lights enable you to carry a compact,
self-contained underwater light system that is capable of providing a
level of illumination previously available only from lights using
surface-supplied power. Among their key features:
HID bulbs have no filament. The HID bulb
creates light by creating an arc between poles. The result is an
extremely bright and powerful beam. Because of the low wattages
required, HID light system burn times are substantially longer than
other types. A 10-watt HID bulb is approximately equal in light output
to a 50-watt quartz halogen bulb.
The HID bulb output has a color
temperature of 6,000-6,500 degrees Kelvin, essentially the same color
temperature as the sun. As a result, the HID light is an excellent
choice for underwater video and digital still photography -- and nearly
any other underwater activity.
HID bulbs are generally rated as offering
approximately 1,000 hours of bulb life. In reality, bulb life is more
directly related to the number of times you turn the bulb on and off.
Once activated, you should give the bulb at least four minutes to warm
up to its proper operating temperature before turning it off. You should
also wait at least a minute before restarting a bulb that has just been