Re: XRGT LEN bin ?
I've heard (not seen myself) that the HDS lights with the GT mark tend more towards a warm white. I only own one light that I know is a Y0 (RY0J) but I would describe it as very cold tinted. It's downright blue, at least as far as white Luxeons go.
Personally, if I bought a GT and it came with a Y0, and it happened to be as cold tinted as my RY0J, I'd be very disappointed and send it back. I guess I'm saying that everyone has a different impressiion of what "white" ought to look like. The problem is further complicated because our brains are constantly trying to "adjust" what we see to make white out of the things we think should be white. If you have a Lux with a tint (and they all do, don't they?) it really starts to play games with your head.
I find that my perception of which of my Luxes is the closest to white will vary from day to day; perhaps even from hour to hour. I also have an RV1K which I find is very white during casual use. But, if I use it right after I've been staring at the RY0J, it looks very green. I've got an old QYAJ which I used to think was my "benchmark white" Luxeon, but these days it's looking rather pinkish/purpleish to me.
Ah well. Tint is a terrible thing to try to get a handle on. I'm finding for myself, it's best to try to accept that all my Luxes have different tints, none of them a truly white, and try not to let it bother me.