What are the advantages of an LED-light?

An LED has an extremely long life span. It is considerably longer than that of a halogen bulb.
The LED is hard to break and very durable.
The cold white (bluish) light of an LED is not as strongly absorbed by the water as the warm white (reddish) light of a halogen bulb. Therefore, underwater an LED light has a greater range.
Due to the individual perception (only in dark environments!), cold white LED light seems to be stronger than warm white halogen light .

What are the disadvantages of an LED-light?

Fairly high costs of the LED and the necessary electronics.
Bad rendition of the red colour.

Conclusion:

We recommend the use of an LED-illuminant for night dives in freshwater, for dives in murky and cloudy water and for cave dives.
Despite a rather low power consumption of the LED modules, a sufficient brightness and a considerable longer burn time is achieved.