I have been using my H502 extensively for a few days and I have been very impressed.
The green halo is a absolutely a NON issue when actually using the light, It only shows up if you look for it on a white wall. The XML tends to be this way with all my XML lights. A very small trade-off for the Brightness / Efficiency of the H502.
In actual use, the flood distribution is perfect, everything within reach is evenly lit.
I for one love the Glow in the Dark "reflector", a quick blast on High charges the GITD and its actually brighter than the .01 Lumen mode, I think this is a very cool feature. Along with the GITD Head band, it helps locating the light in the dark. The GITD material is very bright.
The Cool White tint is perfect for my needs. Pairing this light with my SC600, I have the ultimate EDC combo for work.
And the lowest output, 3 months on one AA? That's outstanding.
Very happy with my purchase!
-Bobby