A very simple high efficiency LED driver circuit project can be designed using the LM3414 and LM3414HV which are 1A 60W* common anode capable constant current buck LED drivers. LM3414 , LM3414HV are suitable to drive single string of 3W HBLED with up to 96% efficiency and accept input voltages from 4.5VDC to 65VDC and deliver up to 1A average LED current with ±3% accuracy.