Bloom doesn't even happen in real life unless you put objects close to light or in a lot of light. For instance, take a pencil and your desk lamp. Turn the lamp on, and put the pencil under it. Now look at the pencil, you can see a little bit of the pencil's color shining off of it, which is REAL LIFE BLOOM. It DOESN'T happen every minute and in the smallest amounts of light. Many games abuse this (COUGHvalveCOUGHhalo3COUGH).
I don't think we need bloom in Blockland.