Hello.
At Photon Tracing kernel:
- "allow caustics" unchecked on glossy (or specular) material - brightness is correct on caustics
- "allow caustics" checked - this increases badly brightness on caustics (variable caustics* only is appearing by path tracing method at less than ~0.3 of roughness on glossy ground) - this is BUG.
--> Please should fix the "allow caustics" bugged for avoid the brightness increased for caustics.
* - Learn the "variable caustics" (new)
"Allow caustics": wrong brightness on caustics at Photon
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Ok. But see below:elsksa wrote:It does appear to simply be the expected increased incoming light from the Photon Tracing caustics convergence.
At path tracing kernel only (not photon tracing) - 6 laps of 1MS/px of regions picked = 6MS/px This is CORRECT brightness.

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i7-12700KF
2x16GB RAM@DDR4-3600
MSI PRO Z690-A DDR4
Zotac GF RTX 4090 <3

SSDs OCZ RD400 0.5TB and Crucial 2TB SATA3
HDD 1TB SATA2
LG BD-RE BH16NS40
PSU 1kW
CRT 19" Samtron 19"
