Safe — they do not have a thread of incandescent or a glass flask, they do not heat up and do not heat the located objects nearby.
Among the features is the high cost. This is explained, in particular, by the fact that in production, expensive rare -earth elements are used — Gallium, germanium. Although low energy consumptions multiplied by the service life allow us to say that now these lamps pay off. Progress does not stand still, and the cost of LEDs decreases, especially after silicon crystals began to be used in LEDs, which had not previously been possible due to the fact that silicon does not have the ability to highlight the light. It is very widely used in other semiconductor devices, but friendship did not work out with LEDs for a long time. Finally, made friends. And this was a breakthrough, since silicon is cheap and public.
