The Universal LightProbe S2 Spectra Sensor tests for LED intensity, and for any color in the visual spectrum, plus white. The Spectra Sensor is well-suited for the test of “boundary” color LEDs, as it can unambiguously and repeatedly distinguish between not only adjacent visual colors such as green and yellow, but it can determine different hues of the same color such as yellow and amber, regardless of LED intensity. The S2 Spectra Sensor now has a super fast response time of under 10 mS.