In the last decade, visible-light photoredox catalysis has evolved into a versatile tool in organic synthesis. However, most reports have used homemade photoreactors in their design and optimisation of new methods, complicating the reproducibility of some transformations. To improve reproducibility and efficiency, laboratory photoreactors have been developed and commercialized. Herein we report a comparison of four commercially available photoreactors in six mechanistically distinct photoredox reactions focusing on the difference in product yields and kinetics as well as the factors which lead to these differences, including reaction temperature and light intensity.