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Haesslich said:
You have to know your needs before making a decision - xenon lights tend to have better penetration through fog and smoke, probably because of the fact that they're casting light across a variety of spectra that LED lights do not, as a rule, generate photons in. They do, on the other hand, take quite a bit of power, which will reduce your runtime significantly.
Again, isolate your requirements, and work from there - what are you doing with it? Are you going to be going into areas with a lot of particulate matter or other items suspended in the air, thus reducing visibility? Are you aiming for distance, or do you need a wall of light? Will this be used outside where there's little ambient light, where there's quite a bit of ambient light (which creates confused lighting conditions)? Are you using it indoors, or outdoors? Urban setting (lots of shadows) or wilderness/field settings?
As far as Luxeons go, you may find a V1 or YO will have better contrast when presented with greenery than a WO or YA will. In general, Luxeon lights without optics don't throw as well as incandescents will, either due to the difficulty of focusing them or because the LED itself does not have the output of a high-power HID or xenon/halogen bulb. Also, the color of the light in general may affect the range that the light is usable under - I've noticed my whiter LEDs tend to have problems with ambient lighting (mercury or sodium lighting), more so than my yellower ones at similar distances.
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Actually I need a wall of light, but the shop owner told me that it will be very bulky and heavy. that is why he introduced to me surefirs G2. The area that I'm going will be totally without lights and near forested area.