Exit illumination

[cda]

So I know LED lighting is not somewhat new, but I have not seen it used that much.

Plus, history of use in place.

So anyone hear of LED lighting fading, and possibly bringing the light level down, over a period of time,below what code requires?

""L70 refers to the point in time when an LED is producing 70 percent of its initial light output. For example, if an LED light fixture produces 10,000 lumens when it is new at some point it will fade to 7,000 lumens. This point in time is referred to as L70. Since all LED light source fade the difference in the time it takes for an LED light to reach L70 is crucial for a buyer to understand in order to make an intelligent long-term decision.""



https://www.flexlightingsolutions.com/blog/

 

[JPohling]

almost all we use these days are LED fixtures

 

[Builder Bob]

LED's do have a gradual lowering of illumination with age....... It may require monitoring unless the UL standard for emergency illumination already covers this reduction of illumination with age.....

 

[TheCommish]

if the LED is not on does the fading still occur? If not over the life of the emergency light I ont see how fading would be a problem.

 

[cda]

if the LED is not on does the fading still occur? If not over the life of the emergency light I ont see how fading would be a problem.

I think it is everyday lighting, just happens to be required to illuminate the exit path.
Not emergency lighting

 

[JPohling]

well at least it will not be burnt out and dark

 

[Mech]

I think the lighting program I used to use had a reduction factor to account for fluorescent bulbs aging over time.