Today some lamps do not have a replaceable bulb as such, the GX53 lamp holder was designed for compact fluorescent and is a flush fitting holder, but most other LED lamps are not designed to have bulb replaced, you change whole lamp.
The old GU10 lamp and 12 volt G5.3 both classed as MR16 (which stands for multifaceted reflector 16/8 of an inch across) do have LED replacements, the GU10 is not a problem, the 12 volt G5.3 however has problems matching the unit which drops the volts to the lamp, mainly due to lamp being under the minimum supply current but also with the frequency of the output.
There is a huge difference between a tordonal transformer and an electronic transformer, the tordonal does not have a minimum output, and is 50 Hz out, but has no regulation output voltage is a percent of input voltage. The electronic regulates the output so far better for old quartz lamps, but also has an output in the kHz frequency range and a minimum output, with a few exceptions.
So the old MR16 lamps have been replaced with new LED lamps with everything built in, because there is a cooling problem with the MR16 meaning the illuminated area is reduced, using a lamp which is 5 inches diameter works better with LED there is a need for a larger area giving out light.
Picture not too good at showing what is there, but I would guess it is one of the new breed without replaceable bulbs.
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