Reaction rate and photonic efficiency for the bromination of 6-chloro-3-methyluracil at Δt = 0–720 s concerning different reaction modules and reaction scales.

Entry	Reactor module	Reaction scale (g)	Reaction volume (mL)	Applied photon flux (μmol s−1)	% yield	Δt (s)	Rate (μmol s−1)	Photonic efficiency (ξext)
1	1XA	0.96	10	46	94	0–720	6.2	0.13
2	2XA	4.8	50	102	93	0–720	31	0.30
3	4XA	9.6	100	185	94	0–720	62	0.34