RGB-led fan ''speedometer''

Title says it pretty much all. Basic idea is the same as previous fan pwm/speedometer control, but rgb led needed bit different approach. all i needed was RGB colours, not all colours what are available, neither colours on the same time. So, i used window comparator circuit to sense voltage levels low/medium/high, and chose led colours RGB in that order. This circuit doesn't have hysteresis connected, i was lazy to add it tot his design. But hey, it works :D

Discussion welcome!