Unique Led Driver design
I am looking for information/assistance with a driver design. I work in the airfield lighting industry, I am currently trying to adapt an LED driver for use with a 6.6 amp ac constant current power supply. I have chosen my light source and have all the characteristics of that device available. This fixture will be dimmable with three given steps, at 6.6amp I need to produce 640ma, 125-175ma at 5.5 amp and 20-40ma at 4.8 amp. Or I can approach it through PWM and adjust the duty cycle to achieve the necessary photometric output. I have determined both current (ma) and photometric output in candela (cd) for each step. Basically I am looking for advice on the best over all method of achieving my end result. The front end seems to be my sticking point, what components to use in converting the 6.6 amp to an appropriate operating system. My company is willing to partner with someone to help with or completely design this power supply. Any information offered will be greatly appreciated.
Thank you for your time.