What is the main technology for a dive light?

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Seven007

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LED Lights - Unless you have been living with the nomads in Mongolia for the last 10 years that you have not heard of LED lights. Christmas lights, traffic lights, billboards and everything under the sun that lights up is going LED.
LED scuba diving lights are cheaper than HID lights, more durable and use a fraction of the battery power.
Not all LED lights are made the same. Some throw off a bluer light, and because of the way LED lights work it can be tough to find one that penetrates the water or casts a wide enough beam.
The debate between what is the better light, HID or LED, is a hot one on most scuba forums. Like everything else, "better", depends on who you ask.
LED diving lights combine a good price, amazing battery life, and near indestructibility to make them a great choice for divers as a primary dive light.
If you are the kind of person that always wants the absolute best and price isn't an issue, HID lights would probably be the best fit for you.
In the next few years this choice will get harder and harder as the gap between LED and HID quality and price gets smaller and smaller.
HID Lights - HID stands for "High Intensity Discharge" and based on pure performance these are the best scuba lights around. They are really bright and really white.
They are also the most expensive.
Besides price another downfall with HID Lights is the bulb. Because it is a bulb it can break, and some models can be a real pain in the ass to change.
On the plus side, HID dive lights are great on batteries. This will help save money and make up for the extra cost of the light over time.
 

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