You are quite right, but my main point about waste was from fixtures that contain more than just metal and glass. Specifically enclosed fixtures for low volt halogen lamps with electronic transformers, and fluorescent fixtures containing electronic ballasts.
A year or two ago a European study showed that the quantity of electronic waste being generated by the replacement of luminaires had skyrocketed from insignificant levels, so now generating comparable volumes of E-waste as the quite heavily regulated industry for white goods electrical appliances. This has stimulated recent political focus concerning how to reduce the enormous and still rapidly increasing waste stream that is suddenly being generated by the lighting industry during the past few years.
When traditional lamps were phased out, one of the justifications was that there are adequate LED retrofits available for almost all general lighting fixtures and that there would be limited need to replace the fixtures. The reality has shown that this is absolutely not correct. The problem is compounded by the quantity of new LED fixtures that are failing long before the published lifetimes. It is made even more severe by the short product lifecycles. If a shop installs eg 100 LED downlights and after 2 years 10% have failed, it is often impossible to obtain visually identical replacements for the already obsolete designs. Or due to natural colour drift of LEDs over time, the new versions look unacceptably different. This often results in the whole installation being replaced and the 90% good fixtures are also thrown out. Often this is justified financially by the fact that the newer versions are more energy-efficient, and in countries with very high electricity prices it is actually cheaper to scrap luminaires that are only a couple of years old.
The result is new requirements on the repairability and upgradeability of lighting fixtures - a new industry that is emerging. Incidentally just last week the UK authorities published a proposal for a new international safety and performance standard governing the so-called “Remanufacture of Luminaires”, which are not adequately covered by the existing IEC / EN standards for LED luminaires.