Lighting updates include all colour setting sent to shaders now. and I now render a so called Luminance pass but this is done at the same time as the colour pass. I basiclly send any bright areas to the second buffer then add it over the top at comp time.
Here's an example of the scene with a light set to red=1.0 and new luminance added on top. This will be also used for Bloom later.
And here's a shot of normal lighting settings.