mat_hdr_enabled
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mat_hdr_enabled
is a console variable available in all Source games since Source 2007.
This command is used to enable or disable HDR lighting prior to Source 2007. This command exists, but is not usable in the Left 4 Dead engine branch onward (except in Portal 2, despite no Portal 2 maps being compiled with LDR lighting).
If set to 0, disable HDR completely.
If set to 1, LDR (SDR) with Bloom is enabled.
If set to 2, HDR is enabled.