lighting

I drive a 2014 Silverado 1500 WT, and recently noticed my low beam headlights have stopped working. I still have daytime running lights and high beams. I also noticed a humming, like an electric motor/fan running, after I parked and turned off the ignition. I don't think I've heard that noise...

I just purchased a new 2016 Equinox LTZ and want to put HID/LED lighting in the interior and front (headlights, fog lights, etc.) The service/repair manual(s) for this car aren't out yet. Helm's ETA is sometime in April. In the owner's manual, it shows the bulb types for the tail lamp...