I'm sure that applies, except "lights without replaceable bulbs are less environmentally friendly" which seems nothing more than wishful thinking.
preferrably soldered on a big metal part
An obvious solution to which would be soldering the LED to a metal connector that mates with a heatsink. We could call it an "LED bulb".
Of the assorted LED bulbs, fittings and sealed LED only products I've so far owned few have got to even 20% of claimed life before colour temperature or brightness has become pitiful. The only exceptions thus far are in my monitors (not exactly room level illumination), and in a few year old torch - but that has usage in hundreds rather than tens of thousands of hours.
So it looks like we really need some replaceable LEDs. Manufacturers would, of course, prefer to sell another desk lamp or kitchen fitting when the LED inevitably deteriorates.
preferrably soldered on a big metal part
An obvious solution to which would be soldering the LED to a metal connector that mates with a heatsink. We could call it an "LED bulb".
Of the assorted LED bulbs, fittings and sealed LED only products I've so far owned few have got to even 20% of claimed life before colour temperature or brightness has become pitiful. The only exceptions thus far are in my monitors (not exactly room level illumination), and in a few year old torch - but that has usage in hundreds rather than tens of thousands of hours.
So it looks like we really need some replaceable LEDs. Manufacturers would, of course, prefer to sell another desk lamp or kitchen fitting when the LED inevitably deteriorates.