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3 hour duration: full brightness?

Guest Sarah

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Guest Sarah

We have just had the emergency lighting at our premises tested in house (small system). Most of the lights were fine, but a couple were not at full brightness at the end of 3 hours. So the lights were functioning, but only at say 25% capacity after the full 3 hours. Is this acceptable, as they were still lit, do they all need to still be at full brightness? 

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