fe222643b4a53fae38bc5ead86551b99abbdc583

This is done using the existing Emission node and closure (we may add a volume emission node, not clear yet if it will be needed). Volume emission only supports indirect light sampling which means it's not very efficient to make small or far away bright light sources. Using direct light sampling and MIS would be tricky and probably won't be added anytime soon. Other renderers don't support this either as far as I know, lamps and ray visibility tricks may be used instead.
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