Strobe light lumens

[rbhall]

I was recently ask to verify the light brightness from strobes mounted on high ceilings (approx. 16') by a triangle method. Does anyone know what that is and how I perform the test? I think the strobes are set at 95 from the manufacture but the building official doesn't think it will be bright enough.

 

[MacGyverS2000]

95 lumens?! That's about the same brightness as a 7-8W bulb. That might attract the attention of fireflies, but not much else.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[Skogsgurra]

Average, I think. With flash duration in the microseconds range and duty cycle like .001 or less, I think that it will be intense enough.
Problem is how to measure. I have no idea.



Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[MacGyverS2000]

Lumens aren't measured in terms of time, though, so duration doesn't mean anything.

Unless we're talking about luminous energy, and then things take a different tack...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[DRWeig]

It's luminous intensity they're concerned with -- equal to the illumination provided by a steady-state light source of code-mandated level.

I'm in a hurry this morning, so I'll point you this way: Google "Luminous intensity of fire alarm strobe" and you'll get a wealth of info from the manufacturers and NFPA. The triangle method is simply a reference to the fact that the illuminance falls off with the square of the distance from the source to the illuminated plane at its far ends.

IESNA Lighting Handbook has examples.

Good on ya,

Goober Dave

Haven't see the forum policies? Do so now: Forum Policies

 

[Skogsgurra]

I was thinking normal light intensity meters. They show average value over time. So duty cycle has a large influence.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.