Headlamp types

Here's what my headlamps look like;

Can it be determined what type of lamps they are by looking? The low beam has been out for 2-3 weeks, and now that it's getting warmer I figured I'd pull the front and replace all four lamps as well as the bullets & turns, just to be done with it. Then a strange thing happened Friday evening. I started the car w/remote to repark it to get a car out with all headlamps working, and both low beams were lit! As I reparked it up to another garage door, it was back to just the driver's side low beam being lit. No amount of playing with the stalk switches made the right low beam come on or flash. Hate to take the front bodywork off and discover it's not the lamp, and don't know if the current lamps are OEM. Maybe coincidence, but the other day I noticed the 3 backup ind. lamps & beeper don't do anything when I back right up to another car. Any thoughts, or things to check?
Is there a build code I should be looking for on the trunk build sticker, or wouldn't it make a difference if there's more than one type of lamp that would look the same behind those lenses and I have no idea if they were changed by previous owner? Wondering if there's a ballast I should be looking at if accessible with the front plastic still in place? Thanks!

CWB said:

You cannot distinguish between LED, HID, or Halogen from the outside front of the housing (what is now inside). You can distinguish which type was ORIGINALLY in the housing by markings on the outside of the clear plastic.

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Awesome, thank you. I've seen motorcycle headlamps where the entire inside reflector of the can was changed to go to a different type of element, and ones where a separate ballast had to be added. Some ballasts seem to be troublesome either due to build quality or installation prowess, so I was trying to find out ahead of time if I should just be jacking it up and getting underneath to look for non-stock appearing wiring anywhere.
The other day when I approached the car after a remote start, the headlamp was back on. Just that one time, and it was off again when I pulled out and waited behind another car. That's what made me wonder about a bad external ballast on an aftermarket type. Since then I've noticed the backup proximity lights and beeping isn't working and the fog lamps don't actually come on (just the dash indicator) when the stalk switch is operated. Has me thinking I may be dealing with black box issues, not a burnt out headlamp element. Thanks again for the lens clarification.