Bouncer
As an extra, if you run your initial render through a two quad stack (top quad set to add, bottom set to multiply), before blurring, you can filter out some of the non-bright areas of your render image (sort of like bumping up the contrast/turning down the brightness).
As an extra, if you run your initial render through a two quad stack (top quad set to add, bottom set to multiply), before blurring, you can filter out some of the non-bright areas of your render image (sort of like bumping up the contrast/turning down the brightness).