They do the same as incandescent bulbs; light up. They are rated for 1500 hours. I installed several of these lamps in an Ikea floor lamp. They break steadily after 1-2 months. The maximum lifespan of these lamps, according to my estimates, does not exceed 350 hours. The windows darken and one day they just don't light up, suggesting they're getting hotter than advertised. For the price they are not worth it. Unfortunately, I couldn't find anything cheaper elsewhere, so I immediately bought two more. Next time I will probably buy a new lamp with different light sources.
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