The DF242 ring light is designed to function like the DF241 light in that it also produces a thin slice of light for very low-angle surface defect detection. The positioning requirements and application envelope are similar to those of the DF241. The DF242’s larger diameter allows an additional LED aim that projects a 2x larger spot size on target compared with the DF241 light. The DF242 ring light differs from the DF196 Dark Field light in a similar fashion to the DF241. Namely, it uses aimed LEDs rather than a central focusing lens, producing a relatively smaller spot projection at close working distance than medium-angle Dark Field ring lights.