BLF recoil über-thrower

You use terms i’m unfamiliar with, so it’s kind of wasted on me.
However, there’s not much more to the radiation diagram than what it shows us.
(edit) ehrmm… there is… sorry…(/edit)

Better to use a primary lens, but that complicates things and you can not zoom out to such a wide flood anymore.

The radiation diagram is not of a circle, it is of a sphere.
The way the intensity is measure is with a fixed distance, so at 0 degrees it is Xcm in front of the led, at 45 degrees it is at Xcm diagonally from the LED, at 90 degrees it is at Xcm to the side of the LED.
I think you can imagine the circumference of the circle at different heights along a sphere, like this

But since the radius increases to the power of 1/2 and the intensity decreases by cosine then between –45 and 45 degrees there is over 50% light output.
So you’re both right, the intensity graph doesn’t tell the whole story and a recoil reflector is still definitely more efficient than forward reflectors or lenses.

The radiation diagram is not of a circle, it is of a sphere.
The way the intensity is measure is with a fixed distance, so at 0 degrees it is Xcm in front of the led, at 45 degrees it is at Xcm diagonally from the LED, at 90 degrees it is at Xcm to the side of the LED.
I think you can imagine the circumference of the circle at different heights along a sphere, like this

But since the radius increases to the power of 1/2 and the intensity decreases by cosine then between –45 and 45 degrees there is over 50% light output.
So you’re both right, the intensity graph doesn’t tell the whole story and a recoil reflector is still definitely more efficient than forward reflectors or lenses.

Is this the wrong image? :stuck_out_tongue:

Okay, thanks for explaining that, especially the picture showing it is (of course! silly me…) a sphere.
This also makes sense as to why i felt that we should collimate at least 120°
And afterall, had i been right, a regular reflector would be quite silly for an LED, and there would be a LOT of silly lights out there.

How so?

I get it now, i needed a picture…
Thanks for trying though. :+1:

But then i still don’t understand why an aspheric lens out throws a forward reflector light… :question:

You’re welcome :slight_smile:

A picture of plants? Am I missing something? What “evidence” is that for? lol

Plants??

It’s the beamshots from page 6:

(isn’t it?)

Mostly due to how the distance from the LED to the lens surface is longer than the distance from the LED to the reflector surface.
Since the distance is greater, the “difference” angle of light coming from the LED is smaller, leading to less divergence.
That’s also the reason why outer parts of a reflector (farther from the LED) collimate light better, like in that image by djozz which I can’t find atm lol

Is this a beamshot???
What I am seeing wrong? Am I blind? Is this what I’m supposed to be seeing??

I am so confused…………….

Alright, but what if we use a smaller aspheric lens, resulting in the same size hotspot at (for example) 30 meters?
Wait, i’ll try it myself, see what we get.

Whoa, what the hell …?
That’s not even mine…
Do you see this picture here too then? :

So much for free image hosting huh? :confounded:

An aspheric light will not significantly out throw a reflector light (all other things equal). The lens will have a little bit more active area due to the “dead” area in the center of a reflector, but this is not usually a large proportion of the total area. There can be variations in reflector quality (shape and reflectivity) that could cause some differences. They should throw pretty much the same because of I=LA and the fact that the LED luminance is constant at different emission angles.

A C8 vs the Ultrafire UF T20 or Uniquefire UF 1505 is a good comparison because they all have the same bezel diameter. The C8 throw is well documented. I could not find many reports of throw in the aspheric lights, but maybe you guys can…

I have like 50 different lenses, and the regular pattern is shorter focal length = larger spot.
Using a smaller lens means you either keep the same focal length and lose more light, or maintain same light collection and reduce focal length (making a larger shotspot)

Yes it shows up there too….
Does it look normal to you?? xD

That i know, but i was wondering what the diffrence would be between fwd reflector and aspheric lens with the same divergence (which would be a smaller diameter lens,or maybe it’s apples and oranges…).
So i was about to compare my Courui with my B158.
Will do that in a moment)

Yes, it does look normal here…
I just restarted my laptop (remnants) to empty all caches (couldn’t find how to do that in my Firefox), but i still see what i’m supposed to see, and it ain’t plants…

Wait, iĺl post the link to my album.
BRB

Here’s my album:

Geez,that doesn’t even work for me… :weary:

How about this then:

And what does this do: