Candle mode works fine with the Niteize conversion...
It may be a little dimmer from the sides, but it is going to last MUCH^2 longer and is not going to break the first time you bump it either...
I was looking at getting the new LED version(I got the LED conversion for the 2D Maglite FROM Maglite and it is quite good), but the extra length kind of pushed me away...
I will probably have to get one just so I can review it for the forums(yea sure... that's a good excuse)...