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Full, bright luminous plasma xenon gives only at high pressure. While the lamp is off (or in a box), it is 20 bar (beware of crashing!). At work the pressure rises up to 100 bar, but here the headlight protects. Some lamps contain mercury, which is also not very good for health. This is why you should not throw such items in the trash, but recycle them. However, the latest models (D3 and D4) do without mercury, which has been replaced by sodium. At the same time, it gives the light a warm hue.