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How often should I replace my fluorescent light globes? I have a couple of 6400k globes and I think one isn't as bright as the other one is. The one I think might not be as efficient any more is left on 24/7 where as the other is not. It's older than the other so it makes sense that it might be on its way out, however, I have no instrument to measure this with apart from my eyes.
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