Re: Life cycle
"LED lights are also expensive - and need specialised recycling"
Not that specialised. You can either dispose of LED GU10 fittings and the like with large metal heat sinks into the mixed metals recycling, or other LEDs into electronics waste recycling, the rest of which which contains much the same sort of mix of diodes and electronics. What's more, the better quality LED's aren't going to need recycling for the fat end of two decades anyway.
The expense issue is a myth as well - the capital cost is higher, but the lifespan is much longer as well as fuel costs lower, and with most lights you'd be getting a cash payback of 18 months to two and half years from an LED. Try finding a financial investment offering you a safe 30% annual return!