is unity_SpecCube0_HDR a reliable way to be used with other HDR textures

Unity Engine
,
1

hi guys
lets say some of my scene was not baked, and/or reflection probe was not to be used anywhere in my scene at all.
would unity_SpecCube0_HDR still have the corresponding value like it should when reflection probe was used, i mean its 1100 on pc, other platform would follow dLDR or RGBM decode value. it will be reliable no matter probe was used or not.

coz if unity_SpecCube0_HDR was not consistent, i may have to send decode value some where else lo

cheers

7504528--924830--upload_2021-9-18_14-35-21.png

2

just tested it, turn out to be un-reliable.

question updated :: how do i know what light map encoding was set in Player Setting ?