I dunno about that vostok, it might not be the light but the radiation that a hid hives off because no matter how cool the canopy is, the closer the light gets the more chance you'll get light bleaching. I keep my canopy at 75 and just got a slight case of bleaching (white tips and leaves) not from the heat or ventilation but from the light intensity itself. Mind you I run a 1000w air-cooled light and was at 14" above the canopy and still have 3 bud tips bleached. No biggie really, but it happens. I moved it to 16" and things seem good now. Installed a new bulb and didn't compensate.