BLF recoil über-thrower

[Enderman]

@Jerommel

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.

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)

@Jerommel

Whoa, what the hell …?
That’s not even mine…
Do you see this picture here too then? :
BLF recoil über-thrower - #158 by Jerommel
So much for free image hosting huh? :confounded:

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

[Jerommel]

@Enderman

@Jerommel

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.

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)

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)

@Jerommel

Whoa, what the hell …?
That’s not even mine…
Do you see this picture here too then? :
BLF recoil über-thrower - #158 by Jerommel
So much for free image hosting huh? :confounded:

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

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

[Jerommel]

Here’s my album:

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

How about this then:

[Jerommel]

And what does this do:

[Jerommel]

I’ll just:

Blame Canada - South Park: Bigger Longer & Uncut (3/9) Movie CLIP (1999) HD

[EasyB]

@EasyB

@Enderman

@Jerommel

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

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

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…

A couple examples to show equal diameter lens and reflector lights are usually pretty close:
UF T20 with dedomed XPG2: 135Kcd

c8 zooming body wallbuys or uniquefire uf t20 ?

I got a de-domed XP-G2 in my T20 that does about 135 kcd - nice light, like the overall quality.

C8 reflector with dedomed XPG2 S4 2B does 170-200Kcd
The T20 lens might have a bit smaller effective area than the C8 reflector.

The Convoy L6 SMO reflector is close to the same diameter as the UF 1504 lens.
DB Custom put a dedomed XPG2 in this light and got 439Kcd.

Convoy L2/L6 modding thread

Sweet! Just in time to get busy on the clear L6 I recently got. I sold my modified black L6 with the de-domed XP-G2 emitter, it’s 439Kcd was needed in Greece. My XHP-35 L2 and the ready and willing clear L6 are still holding down the fort here, with some plans for the clear L6 that will require me to have time at the lathe to pull off. Let’s just say it should be a nice thrower in the end. Looking forward to see what others are doing…

A UF 1504 will do 450-500Kcd with a dedomed XPG2.

[Theodore41]

I think that if we remember the car headlights,they had recoil sets of some type.You can look at here.
Headlamp - Wikipedia ,especially the Optical systems, Reflector lamps,
Lens optics.

[mdeni]

For this kind of light a BOX design (or cylinder) is the only viable option. That is why all military reflectors are that style.

The box design will give maximum distance from the LED to the Mirror, and with that it will have maximum focal distance. And smallest spot.

It will maximize the diameter of the mirror, and improve the light catching angle.

It will provide the best absolute throw given the size of the light by far.

[Jerommel]

@mdeni

For this kind of light a BOX design (or cylinder) is the only viable option. That is why all military reflectors are that style.

The box design will give maximum distance from the LED to the Mirror, and with that it will have maximum focal distance. And smallest spot.

It will maximize the diameter of the mirror, and improve the light catching angle.

It will provide the best absolute throw given the size of the light by far.

Amen!

I wonder if it can be made zoomable, by moving the LED towards the reflector.
A recoil zoomie.

[Jerommel]

@Theodore41

I think that if we remember the car headlights,they had recoil sets of some type.You can look at here.
Headlamp - Wikipedia ,especially the Optical systems, Reflector lamps,
Lens optics.

Incandescent lightbulbs and HID lightbulbs usually do both, because it also uses the bottom part of the reflector.

[Enderman]

@Jerommel

Amen!

I wonder if it can be made zoomable, by moving the LED towards the reflector.
A recoil zoomie.

It can, but the LED needs to move quite a distance, several cm not mm, also when you zoom to create flood you will have the huge dark spot in the center due to the LED

[Jerommel]

@Enderman

@Jerommel

Amen!

I wonder if it can be made zoomable, by moving the LED towards the reflector.
A recoil zoomie.

It can, but the LED needs to move quite a distance, several cm not mm, also when you zoom to create flood you will have the huge dark spot in the center due to the LED

I was thinking as close as the heat pipe will allow it, but you’re probably right.

[Enderman]

I found this, I think the top left mirror is the parabolic 3.5” listed in the description because the only one that is bigger is the 4” one.
Depth looks pretty good for recoil, and it’s optical grade glass reflector.
Thoughts?

Optical Mirrors, Lot of 11 - Mirrors - BMI Surplus

[The_Miller]

notebook heatpipes.
there should be a heatpipe in most notebooks, and the cool thing is they are normally not round but flattened
in this recoil thrower situation this means a lot of light can pass while it takes the heat away, the inner structure should make orientation not affect preformance

[Jerommel]

@Enderman

I found this, I think the top left mirror is the parabolic 3.5” listed in the description because the only one that is bigger is the 4” one.
Depth looks pretty good for recoil, and it’s optical grade glass reflector.
Thoughts?

Looks good to me!
How can i get one?

[DavidEF]

@Jerommel

@Enderman

I found this, I think the top left mirror is the parabolic 3.5” listed in the description because the only one that is bigger is the 4” one.
Depth looks pretty good for recoil, and it’s optical grade glass reflector.
Thoughts?

Looks good to me!
How can i get one?

Go to the link and buy the whole lot of 11 various mirrors (only one of them is the 3.5” he mentioned) for $150

[Jerommel]

@DavidEF

@Jerommel

@Enderman

I found this, I think the top left mirror is the parabolic 3.5” listed in the description because the only one that is bigger is the 4” one.
Depth looks pretty good for recoil, and it’s optical grade glass reflector.
Thoughts?

Looks good to me!
How can i get one?

Go to the link and buy the whole lot of 11 various mirrors (only one of them is the 3.5” he mentioned) for $150

…that’s why i said how can i get one, that 3.5” one…

[Enderman]

There’s no information on who made it, and if you were to buy a new one it would probably cost several hundred or thousand dollars…
I emailed them and maybe they can sell me that mirror alone rather than all 11.
A bit small, but maybe it will make a nice handheld light even if it doesn’t have good throw.
Can always just stick my XHP70 in it and have a flood monster

[The_Miller]

have you guys seen this?
paraboli mirror with clear focal point
We have a solar cooker, basically a 1,20M version of this, focus is very good on a small section inside
Let e check what it does with, hmm say a Jaxman Z1 (so I can play a bit with what light is emitted)
report back on it later.

[The_Miller]

68mm parabolic reflector