One additional question: Which lamp module will work with LED bulbs without flickering?
I personally have three XPD3s with LED lights and no incandescent bulbs in the mix. All the lights I bought were billed as dimmable. The BR40 bulbs don't dim to 10% as I would like (probably 30% lowest) but the BR30 bulbs dim perfectly. The BR40s are Hyperion from Amazon and the BR30s are TCP, if I remember correctly. Both bulbs had one failure each and I was immediately shipped replacement bulbs. I just installed under-counter LED strip lights and even they don't flicker connected to a lamp module.
The specs on these things change on a regular basis so YMMV.
I also have a 40-60-100 three way bulb on an appliance switch so no dimming capability on purpose. Set the wattage you want manually and the timer turns it on at specified times. My 4' tube LED garage two bulb unit is also on a switch and works perfectly.
In fact the only non-LED bulbs I have are a couple of night lights at 5w each and it just doesn't make sense to change those.
FWIW, if it's dead silent in the house I can occasionally hear the slightest hum from some of the BR40s but it's one or two of the bulbs out of 9 in the kitchen, not all. There's no way I'm drilling into that.
Be careful when specifying the module in AHP. I ordered regular dimmable modules but received the PRO version. I struggled with getting them to work properly because I selected the regular module not the PRO version. I just figured it out and now everything works exactly as designed and intended.