I got this new grow light from mars hydro and surp...

CRI Color rendering index. Not all LED are created equal. Efficiency is one thing, how well each color renders/replicates sunlight is another. Until recently reds have been a linchpin, being considerably less efficient and most LEDs have bad red CRI r9 of less than 80. Still perfectly good for growing. If you want to reap the full benefits of true sunlight having a full spectrum of 99+ CRI led on all indices would be neat. But at great cost. While CRI is a human metric, it can be useful in horticulture because it indicates how good visibility is for humans. However, in horticulture, it's more important to focus on metrics other than CRI, such as wavelength, intensity, and duration of LED exposure. While both are related to light quality, "Kelvin" refers to the color temperature of a light source, indicating the ratio of red to blue (measured in degrees Kelvin), while "CRI" (Color Rendering Index) measures how accurately a light source displays the true colors of objects under it, essentially assessing the quality of color rendition, not just the color itself. High Color Rendering Index (CRI) LED grow lights can improve plant growth, but they don't necessarily increase photosynthetic efficiency. High CRI lights excel in closely mimicking the spectrum of natural sunlight, offering not just essential wavelengths for growth but also enhanced color fidelity. This quality is particularly beneficial for ensuring that plants appear in their true colors, facilitating better monitoring and care by growers. Like everything comes with a price tag.