Direct= an area receiving direct sunlight for an extended period of time (6+ hours), such as an unobstructed south-facing window
Bright filtered= direct light filtered through a blind/curtain or a leafy tree
Bright= brightest areas of a room that are not in direct light or constantly in direct light, i.e. unobstructed east and west-facing windows
Moderate= a constant level of light but never direct light, i.e a north-facing window, or an east or west-facing window obstructed by a blind/curtain or a leafy tree
Low= an area 8+ feet away from a window, such as the corner of a room