Table S4.

SAXS derived structural parameters

	Rg (Guinier), Å	I(0)	Peak Abs280	Rg (GNOM), Å	Dmax, Å
Dark (no UV)	25.9 ± 0.2	363 ± 2	*	*	*
Dark	25.8 ± 0.2	775 ± 6	0.527	25.7 ± 0.1	82
Weak LED	27.6 ± 0.2	813 ± 6	0.576	29.6 ± 0.2	115
Medium LED	33.3 ± 0.4	785 ± 8	0.52	37.0 ± 0.3	135
High LED	34.5 ± 0.4	937 ± 9	0.574	38.0 ± 0.2	135

^*UV was not collected and the SAXS data was collected at a different q range, therefore real space analysis was not comparable.