Multi-spectral photometric stereo can recover pixel-wise surface normal from a single RGB image. The difficulty lies in that the intensity in each channel is the tangle of illumination. albedo and camera response; thus. an initial estimate of the normal is required in optimization-based solutions. https://www.spidertattooz.com/2ft-LED-Strip-Light-Fixture-10-19-Watts-3000-Lumens-35K-40K-50K-120-277V/