LRV stands for light reflective value and refers to how much light a paint color reflects. The lighter the paint color, the higher the LRV number. Low LRV is typically in the 0-40 range.
These are darker colors that absorb more light than they reflect. This means that they often need fewer coats to achieve better paint coverage. Finally, higher LRV colors are in the 60-100 range. Indeed, these colors reflect more light than they absorb. The drawback of high LRV paint shades is that they require at least 2 to 4 coats to cover.