Remove two-sidedness in light emission power estimation #965

Job	Run time
macos-13 / Release / homebrew-clang	29m 32s
windows-2019 / Release / cl	38m 1s
macos-13 / Debug / homebrew-clang	18m 58s
ubuntu-22.04 / Release / gcc-11	19m 53s
windows-2019 / Release / clang	38m 38s
ubuntu-22.04 / Debug / gcc-11	17m 12s
windows-2019 / Release / clang-cl	34m 54s
ubuntu-22.04 / Release / gcc-12	21m 37s
windows-2019 / Debug / cl	24m 44s
ubuntu-22.04 / Debug / gcc-12	18m 22s
windows-2019 / Debug / clang	34m 45s
ubuntu-22.04 / Release / gcc-13	29m 53s
windows-2019 / Debug / clang-cl	33m 21s
ubuntu-22.04 / Debug / gcc-13	27m 35s
windows-2022 / Release / cl	40m 56s
ubuntu-22.04 / Release / clang-14	18m 32s
windows-2022 / Release / clang	47m 32s
ubuntu-22.04 / Debug / clang-14	14m 17s
windows-2022 / Release / clang-cl	43m 56s
ubuntu-22.04 / Release / clang-15	17m 59s
windows-2022 / Debug / cl	35m 58s
ubuntu-22.04 / Debug / clang-15	16m 4s
windows-2022 / Debug / clang	43m 10s
ubuntu-22.04 / Release / clang-16	18m 24s
windows-2022 / Debug / clang-cl	38m 44s
ubuntu-22.04 / Debug / clang-16	15m 36s
ubuntu-22.04 / Release / clang-17	26m 55s
ubuntu-22.04 / Debug / clang-17	22m 3s
	13h 7m 31s

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