Letters to the Editor
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But will the light really be left on for 50,000 hours?
In the initial question, there's no mention of what use the lighting is part of. Your calculations do assume 50,000 hours of continual usage, which if nothing else should be noted as thus presenting one endpoint in the range of usage situations. Now, if we're broadening out the discussion (as many of the letters have done), it is an easy extension to consider whether there are that many situations in which lighting must remain on continually, and indeed whether we can change our behavior (even in industrial and commercial applications) to reduce usage. The more we are able do that, the less relevant your actual calculations become in real world situations.