I have a few and they work pretty well, I tend to use Magaman ones as they work well and seem to be a little more reliable.
As for LED, forget it, its bloody awful light to do anything meaningful with
no no no no sir.... LED has come a very very long way.... warm white (like normal bulbs) and cool white (hint of blue)
the only problem with LED is the initial cost... everything else about them is spot on
and yes Megamann are very good and have a very good reputation. most the sparkys i know would use them.... they just a lil too pricey (they took advantage of their good products im guessing)
Totaly disagree, its naff.
The biggest issue is the limited light spectrum emmitted.
The white light is made up of 3 fairly narrow bands of light in the form of Red, Green and Blue and is emmitted from numerous PN junctions across the chip surface.
Although to the human eye this appears white and you can change the appearance of the light by varying the intensity of the colours, this does not result in a useful light.
The biggest issue is that when this light is reflected of a surface, a lot of detail is lost due to these narrow spectrums of light.
Hence, other than lighting lifts and corridors, its of little use for everyday working and can be bloody dangerous for work where there is safety risks.
I know there is a lot of work at the moment based around UV LED technology which is then coated in a phosphorous outer resulting in a broader spectrum of light being emmitted but, this is still some way off.