This is a QuickWire socket, meaning in the back will be wire port holes. Simply strip the wire back 1/2" and push in the wire to the correct port hole. Once in, it will not come back out.

This wires in addition to the socket and/or ballast and will turn the unit off once it reaches a temperate higher than what the thermal regulator is rated for. Thus preventing the application from letting the bulb overheat

Yes it will work for any G4, GU4, GZ4, G5.3, GX5.3, GY5.3, GU5.3, G6.35, GY6.35

No, to hold hte bulb you need a clip specific for your light bulb, but you can mount a bulb clip to the socket.

You strip the wire back 1/2" and the wire pushes into the 2 port holes on the back and once in you cannot remove, this is called QuickWire

To test you would need to have an ambient thermometer and over heat the area of the thermal protector to be higher than what the unit is rated for. Then it would shut the application off until it was below that temperature.

It should not be hot, it may be warm.

9" long

No this is only meant for halogen, not LED

No this is stationary, the spring loaded version is LH0797

3000k

They are packed in boxes of 12 but you can order as many as you want per order

Any items on this page that start with "NDV" are accessories - https://www.semperlite.com/products/fixtures/led-fixtures/accessories?filtercache=82cd10de-6a40-42c0-9123-9a8b8b26a501

With rings they are made for specific sockets, width alone will not let you know if its for that socket because of thread pattern - here is the socket that ring is made for (G9 halogen) - https://www.semperlite.com/product/golo-g9-threaded

No it is obsolete, see item EL/LED/12/4000/XL https://www.semperlite.com/product/hera-elled12-4000-xl

Yes see item EL/LED/12/4000/XL, it is LED and will use the same plugs and connectors - https://www.semperlite.com/product/hera-elled12-4000-xl

26.291 is only a series number, there are 12 items in that series. Please send us an image of your item

Yes see item EL/LED/22/3000/XL