Lighting efficiency has a lot more to do with what goes on inside the actual bulb. LEDs are low voltage DC devices too and they are more efficient at producing light than fluorescent fixtures, MH or bulbs with filaments. Not sure of the principle behind xenon, sounds like a gas type deal like neon or fluorescent. I do know xenon arc bulbs are used in high intensity searchlights for aircraft and they can burn a hole through concrete if left shining in one spot for any length of time. Most bulbs still produce more heat than light with the current they use. That's where LEDs are a little ahead of the game. I suspect that if xenon was a viable technology for aquarium lighting, some intrepid engineer/company would have designed a fixture by now.
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