Vat photopolymerization (VPP) is a 3D-printing method for selectively curing photosensitive resins with actinic or UV light. This method has gained significant importance in the production of polymeric parts in a variety of technological fields. Not being limited to industrial applications, VPP has also evoked great interest in the medical and dental field among others. Besides classic stereolithography (SLA), that uses an UV-laser to cure liquid resin, further advancements of the technology have brought full-layer exposure using DLP (digital light processing) or LCD (Liquid Crystal Display) to structure the exposure. For the resins used in these systems, knowledge of the key properties related to the polymerization process, E_c (critical energy to initiate solidification) and D_p (penetration depth of curing light), are crucial. Since the light intensity influences the rate of photoinitiator (PI) decomposition, both values might not only depend on the properties of the photosensitive resins but also on the intensity of the light used in the process. In this study, the impact of the light intensity (0.7–14 mW cm⁻²) on E_c and D_p of two commercially available resins (pigmented and unpigmented) was examined at 405 and 385 nm. The results revealed a minor but significant dependency of E_c and D_p in the range of 1 mJ cm⁻² for E_c and 30 microns for D_p, respectively. While both quantities show an upward trend at 385 nm with rising light intensity, for 405 nm, the values generally decrease at higher light intensities.