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Choosing out of gamut colors in 32 bit float for HDR
I am trying to make an hdr texture for lighting.  Technically, I can make this in Gimp, but for my sun I need an extremely high luminance value.

In the color picker, the largest value I can input is 500 in HSV, which translates (I guess) to 300 Luminance in LCH.

That's a problem because the shadows are too soft.  I need to go much higher than that.  Is there any way to do this?  The only workaround solution is to add lots and lots of exposure to get a pixel value above 500.

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