LEDs by far have been the most safe and the most efficient type of lighting. From the field of environmental engineering, semiconductors which compose the LEDs are far more safe than mercury is. LED lights are more difficult to break, and take 1/10 the electrical output of an incandescent, to shine even brighter! Semiconductors are also not volatile like Mercury is. LED bulbs are also durable in comparison to fluorescent or incandescent. My family replaced our Christmas lights with the LED equivalents as they died out, it made our Christmas displays cost less in the power bills
I like LEDs too. They are fantastic in flashlights. However, they are not good for all applications. I recall reading this past winter about some morons who decided it would be a good idea to use them in stoplights in places up north. Apparently, in winter conditions the things would freeze over making them essentially not funcion because they couldn't be seen. You see, LEDs are so efficient, they give off very little heat. Simple, old-fashioned light bulbs provided their own built-in heating source to keep them from freezing over. They ended up having to add small heaters to the stoplights to keep them working in snow. Not only was that stupidly expensive, it completely nullified the "energy savings" they'd been hoping to get by going with LEDs. Not only that, now the entire system is more complex because it needs a separate heating element, thus making it ultimately less dependable and prone to failure.
Yet another unintended consequence of the eco-nazis.