Here in the US (and probably Canada and most other countries) there are Fire and Life Safety Codes which strictly specify locations and brightness levels of egress signage, and most jurisdiction's inspectors are NOT flexible at all about allowing reduced brightness levels.
Having said that, I am aware of SOME cases where the area's inspectors have granted permission for lower brightness on exit signs, but that is a rare exception rather than a rule. None that I am aware of have allowed them to be dimmed by any kind of electronic control, (because dimmers can and do fail, plus most exit signs here have built-in battery backups whose chargers don't get along with dimmers) but were instead allowed to use lower wattage lamps. (Obviously this was some time ago and modern exit signs are mostly all LED now.)
You may not follow the "There was no other way" but out here, the Fire Marshalls and inspectors can and will shut down a business for even the smallest of Code violations. Fighting them rarely if ever works out to your advantage, as you may win that one battle, but the war will go on as they nit-pick and dig in to find other "violations."
Having said that, I am aware of SOME cases where the area's inspectors have granted permission for lower brightness on exit signs, but that is a rare exception rather than a rule. None that I am aware of have allowed them to be dimmed by any kind of electronic control, (because dimmers can and do fail, plus most exit signs here have built-in battery backups whose chargers don't get along with dimmers) but were instead allowed to use lower wattage lamps. (Obviously this was some time ago and modern exit signs are mostly all LED now.)
You may not follow the "There was no other way" but out here, the Fire Marshalls and inspectors can and will shut down a business for even the smallest of Code violations. Fighting them rarely if ever works out to your advantage, as you may win that one battle, but the war will go on as they nit-pick and dig in to find other "violations."
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