End of Life
Mercury vapor lamps do burn out eventually as the burner electrodes wear, increasing the arc gap. As the lamp nears the end of life, lumen depreciation becomes noticeable. This comes about because the emitter is deposited as a film darkening the arctube wall and reducing light output.
Read more about this topic: Mercury-vapor Lamp
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“Human life consists in mutual service. No grief, pain, misfortune, or “broken heart,” is excuse for cutting off one’s life while any power of service remains. But when all usefulness is over, when one is assured of an unavoidable and imminent death, it is the simplest of human rights to choose a quick and easy death in place of a slow and horrible one.”
—Charlotte Perkins Gilman (1860–1935)