When i export with filesaver "only write luxcore scene" in LuxCoreBlend, it converts hdr format light map into exr format where on sun, the pixels are bright 10 000 000 000.
This is brighter than on original hdr light map times the hemi lamp gain used.
Also, the scene.scn file points to exported exr file with applied gain, but there are gain values in scene format, isn't it doing another gain conversion and so clamping dynamic range even more.
Hemi lamp gain
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.