Hey, architectural lighting designer here. You have some good lighting questions here so hopefully I can clear some things up for you. First of all any light that emits white light can be considered full spectrum. If you look at the spectrum of color temperatures for white light sources, you'll see that white light can have more blue in it (cooler) or more red in it (warmer). The ones you're looking at are tuned to a rather cool 5000K color temperature, meaning more blue light but all the other colors are still present. Why is that useful? Well humans react differently to those different color temperatures. Warmer color temperatures feel cozy and warm while cooler color temperatures can feel harsh and utilitarian. Apart from how these color temperatures feel to us, they also correspond to light from the sun that reaches Earth at different points throughout the day. When I was getting my masters in lighting design, the professors and designers emphasized how light effects human circadian rhythm. Circadian rhythm in all living things on Earth is based in the 24 hour light/dark cycle. Besides the day(light) and night(dark) portions of the cycle, the white light of the sun that reaches the Earth changes color temperature based on the sun's position relative to an observer. The sunlight at sunrise and sunset is much warmer than the sunlight at midday which is usually very cool on the CCT scale. In that sense, cooler color temperatures are more akin to daytime while warmer temperatures are more similar to the morning and evening. This is a main reason why higher color temperature light sources are marketed as increasing working efficiency, because our brains are hardwired to do work in the daytime when the sunlight is a very cool color temperature. From my own experience, I very much appreciate the cooler temperature light for while I'm working. It reminds me that there is still day light left and work to be done. I personally use and regularly specify 4000K light fixtures in office and industrial architecture projects. I typically don't go higher than 4000K but I will say that when it comes to designing spaces, the person who occupies the space the most is always right. There is a lot of preference involved too. I would also say don't buy grow lights for your working space. The main difference between grow bulbs and regular bulbs is the amount of light that they give out. Grow lights supply way more light than is needed for human tasks so you'll likely end up using more energy/money with that kind of a solution. Answer from scamp_shrimpy on reddit.com