Moving beyond heteroleptic iridium NHC complexes, Glorius and co-workers reported the use of the homoleptic complex, fac-Ir(pmb)3 (where pmb represents N-phenyl-N'-methylimidazolium) (ET = 3.1 eV), in a De Mayo-type ring expansion reaction to access medium-sized rings. This represents the first reported use of a homoleptic iridium NHC complex as a photocatalyst. Despite its promise, there has to date been no subsequent study to probe the wider value of this class of complex in photocatalysis, particularly as a photoredox catalyst given it is strongly photoreducing (E*ox of -2.35 V vs. SCE in MeCN). Some organic photosensitizers possess comparably high ET or E*ox values, such as benzophenone (ET = 2.99 eV), xanthone (ET = 3.21 eV) and N-phenylphenothiazine (PTH, E*ox = -2.1 V vs. SCE). There are some notable inherent drawbacks for these PCs, including their poor visible light absorption that often requires the use of sub-stoichiometric amounts of PC, and an increased risk of side-reactions between substrate and photosensitizer, particularly for ketone-based PCs. As imperative as it is to identify cheaper and more sustainable PCs to platinoid transition metal complexes, it is evident that iridium complexes remain amongst the most attractive choices for PCs that have both a high triplet energy and are strongly photoreducing. Where values for ET were not reported, E0-0 is included.