Given the latest trend in light sources, and in particular, the widespread use of LED lamps, we began to rethink the old lighting standards for colour vision testing. We (J. Leid) therefore conceived a new, easy to use, calibrated lamp with a specific ergonomic design, emitting light with a spectrum close to that of the standard D65, and perfectly adapted to pigmentary colour vision tests. A prototype conforming to a strict set of specifications in terms of quality and quantity of light, as well as ergonomics, was tested against a Macbeth lamp and fluorescent lighting, on controls and patients with congenital and acquired dyschromatopsia. Tests performed using our new lighting reveal, at a minimum, the same types of dyschromatopsia as the ones found with the old devices, and, in some cases, led to a more precise diagnosis, which we confirmed using an anomaloscope. These results demonstrate that an appropriate LED lamp permits perfect colour vision testing and appears superior to prior technology. The objective of the True Color LED Lamp is to offer practitioners a modern, energy-efficient, maintenance-free, compact, effective technological tool with specific ergonomics and a colour spectrum that provides optimal lighting for pigmentary colour vision testing, coupled with a double level illumination, which constitutes a favourable replacement for older devices which are no longer available or insufficiently calibrated.