LED-based lighting for general illumination was first introduced about 20 years ago. As LEDs became more and more prevalent, concerns began to develop about the magnitude of lumen and chromaticity ...

We were having lunch at the Bayard Cutting Arboretum when I looked up at the ceiling and noticed the following light fixture. Figure 1 This ceiling light fixture has light sources with different color ...

It is easy to visually check the brightness variation and chromaticity variation of an LCD monitor, but first you'll need to know exactly what they are before you can look for them. Brightness ...