So with HDR lighting the idea is that we can have high lighting values. But what scale should be used? Like if I want to make a light source emit RGB (100, 100, 100) what do those values mean? Or does it not matter and I just need to make sure everything balances out? What intensity would be considered "bright" for bloom effects?
Also for LDR lighting, I used a linear light attenuation, but it seems quadratic is more necessary for HDR as the light intensity near the light needs to be reduced faster otherwise the scene looks too bright. Is this common practice?
With respect to tone mapping, it seems HDR light values will affect the "middle gray" value. That is, if lights are emitting intensities (100, 100, 100), the average luminance will be a lot different than if lights were capped at (1, 1, 1). So how do I choose a good middle gray value? They say a normal key is 0.18, but I think it would depend on the average luminance which depends on what light scale I choose.
Thanks for any advice.