Have you measured the power factor of your circuit? I am a little bit curious as from what you described, it doesn't seem that you are using any inductive or capacitance load so your PFC should be pretty close to 1.
I have not measured the power factor of the "current implementation," but I know it's bad, because I can look it up. The current implementation uses several large DC power supplies. I can look up the power factor in the datasheets for those supplies and confirm that it's terrible.
Why on earth do you want to have a power factor corrected power supply.
To avoid having to upsize the infrastructure (read: electrical circuits in my home) supplying the LED arrays to deal with the current spikes that occur with a poor power factor. As I'm sure you're aware, a load with a poor power factor (such as the DC supplies I'm using with passive rectifiers in them) pulls a very high current for a short portion of the AC cycle. This current spike means that I need to severely de-rate the wiring, breaker, and other infrastructure supplying the circuit.
In the end, this is also partially academic. I've built the entire rest of this project from scratch, so I understand it thoroughly. The concept of active power factor correction is the only (potential) part of this project that I don't know enough about to build myself, hence the question. I'm frustrated that I cannot research this easily on my own, due to the vast amount of meaningless noise that's out there on this subject, so I'm wondering if anyone can point me in the direction of some meaningful material on the subject.