It’s my understanding that too much far red spectrum in the light can stop plant cells from producing chlorophyll. Some strains are more sensitive than others. If it were albino the whole thing would be white not just four tips on the tallest bud. Is that a burple light or does it have a ton of red?
Interesting, I assumed it was all the extra blue in LEDs vs HID that caused the light bleaching? It seems to be an LED only thing either way, because I've got plants right now, and have seen many others not more than 18" from a 1000w hps and the buds don't bleach like that. The leaves seem to react by becoming lighter and more translucent, almost like it's trying to allow the excess light to pass through. The buds are mostly unaffected.
This gal is about 18" from my light lol. Wasn't expecting it to get that big as it was only about 12" when I flipped to flowering. Now it's probably 40" tall or more. And I had another plant with a sativa dominance get so tall it almost touched the light, but still no bleaching.