Say you had two flashlights rated for 350 meters and you shone them on the same spot. What would beam distance be?
700 m.
Thats wrong
You have to carry 4 Flashlights
and put them parallel together to get the double in Lux or meter-
ca 430
Don’t agree. A throw of 350m by definition means the light intensity at 350m is ¼Candela (Cd).
Now the part I’m not certain about is: can you simply add up the Cd of different sources?
If so, the light intensity at 350m would be 2*¼Cd =½Cd.
That means the distance of the new point where the intensity is ¼Cd lies at 495m (350m *sqr.root of 2).
I could not find any info on adding up Cd’s in *oogle.
Best I can do is lining up a pi$$ing contest of my only 2 light that ought to be identical twins (but aren’t).
To see if the values on the luxmeter double if I shine both lights at the same time.
You’re right of course. Stupid me :person_facepalming:
(was somehow thinking about doubling brightness at the same distance)
This is something similar to what i have been wondering but have no idea about calculating it.
Say you have 4 reflectors 86mm in diameter the setout radius is 29mm will this give you more spill because each led it is losing its individual reflector Compared to 4 86mm reflectors with a setout radius of 43mm?
I know you have to get smallest with highest intensity for throw but what about say you have a light recycling collar and you have light sources blocked by the appature do these increase the intensity off the one that is not?
The candela is linearly scaled, but actual throw is not linear to candela.
Intensity is directly proportional to the working area of a reflector. So in the case of quads above, the area of the enclosing circle minus 4 cutouts near the edge minus 4 LED openings.
So if you leave more of the original reflectors you’ll get more throw.
The latter will capture more light and put it in the main beam, deducing it from spill.
I’m not sure how will the spill shape be different in these cases.
Cheers Argo, I’m still trying to get my head around it. The one I am building is a triple but has the setout radius the same as the reflector radius (like the second drawing). It also looks like most commercially available reflectors are setout like that.
So 495 meters. Thanks.
Yeah, it’s a square law, so 495.
You need 4 for 700m.