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Description
Lighting using HDRI-map is very realistic, but often "sluggish" and low contrast.
Enlarge image contrast, you can use simple processing HDRI-map in Photoshop.

If you have questions, I am ready to answer.

UPD

If the sky is "neutral" and does not have any shades (red or yellow), as an alpha channel, you can use the "green" channel. Because it was he who carries basic information about brightness.
In this case, the "blur" is not required.

Description
Lighting using HDRI-map is very realistic, but often "sluggish" and low contrast.
Enlarge image contrast, you can use simple processing HDRI-map in Photoshop.

If you have questions, I am ready to answer.

UPD

If the sky is "neutral" and does not have any shades (red or yellow), as an alpha channel, you can use the "green" channel. Because it was he who carries basic information about brightness.
In this case, the "blur" is not required.