[Paul Stenning]

There would also be compatibility and customer confusion issues, because every manufacturer would have different connector types, and variations of those for different lumen levels etc. It would also make the overall unit bigger to accommodate the connector. They would also need to design the power supply part to not fail if run with no load.

When it stopped working the customer would have to somehow work out which part needed replacing, find and purchase that (if still available), fit it together and hope for the best. Chances are they would buy the wrong part, or a different brand or lumen level and it wouldn't fit or wouldn't work.

When the whole lamp only costs about £2 it just isn't worth the bother. It is a single replaceable item like the filament and CFL bulbs they replace, and in reality they are reasonably reliable and long lasting, even if they don't achieve the claimed 25,000 hours or whatever.... if anyone is counting!