My 4B-SST runs really cool - its temperature hardly rises above ambient, even after a heavy session driving IB1s (4ohm load).
My 4B-SST is at the bottom of the rack, with a 5B-ST above it , and a SP-1.7 above that. I've had no problems at all due to temperature or heat.
By comparison my 4B-ST ran very hot, but it didn't cause any problems either.
I am red/green colour blind as well! But I HATE blue leds - I find them too bright and piercing. In fact I have replaced blue with red leds in any equipment that I have owned previously. Fortunately Bryston have not followed MF's 'bling' trend!