Primary dive lights are typically larger dive lights with wide beams.  Primary dive lights can be used during daytime dives or at night.  However, the largest dive lights may be overkill for daytime diving.  Many divers prefer rechargeable dive lights, which typically cost a little more initially, but save money on batteries and are more environmentally-friendly in the long run.

Compact dive lights are typically smaller dive lights with a narrower beam.  Compact dive lights are handy for daytime dives to look into reef cracks and crevices.  These types of lights can be carried in your BCD pocket and are excellent as a secondary, or back-up, dive light on night dives.  Compact dive lights are also available in rechargeable versions. 

Many primary dive lights and compact dive lights are available in standard bulb and LED or HID (high intensity discharge) versions.  Dive lights using standard bulbs are generally less expensive, but typically do not provide the brightness of an LED or HID and tend to use batteries more quickly.  LED dive lights and HID dive lights are typically much brighter than standard dive lights.  Although LED dive lights and HID dive lights are generally more expensive than standard dive lights, their bulbs tend to last much longer and they typically use less energy, which allows for longer battery life and is more environmentally-friendly. 

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