Incredible Lighting R Value References. When a product or home has a. But the specific ability of a lighting product to accurately reproduce red is critical to accurate overall color rendering.
Color rendering index (cri) is the measurement of how colors look under a light source when compared with sunlight. One major reason it's important to know the r9 value of a lamp is because energy star states that an acceptable cri is having a value greater than 80 and an r9. It faces south and during the the winter in massachusetts when the sun shines through, it provides plenty of light and passive solar gain.
