So that the PVC tube doesnāt get lit up from the inside?
Yeah I could, but that would prevent me from sliding the LED assembly up and down the tube for focusing.
There are also the holes on the bottom side of the front for air exhaust, which I canāt cover up.
I didnāt really feel it was a problem, so I just left it as is.
This is the stray light that passes through the wavien collar without getting reflected back to the LED.
If it was light coming directly from the LED it would be much brighter.
I did line the inside of the head section with blackout paper, since some LED light does hit there directly with this longer focal length lens.
So you are doing a reflector build for your next torch. What if you make it so you put an aspheric focusing just the hotspot opening? @#$% with the spillā¦
In a reflector-based light, the hotspot comes from the light which goes sideways into the reflector, and the spill comes from the part which goes forward directly out the lens. This is exactly backward from how an aspheric thrower works, so they donāt really combine well.
As far as I do understand, ToyKeeper, the reflector hotspot is a combination of the sideways carefully bounced at the right angle emitter output and the corresponding narrow central angle emission (the longer the throw the narrower this part is, doesn't it?). However I can see how increasingly difficult to manufacture, costful and shape emitter optimized a reflector is to be for maximum performance.
I'm no expert in optics, Enderman may shed some additional light for sure (like how big and how far the lens would be required to sit). The question is: What'$ thā¬ namā¬ of all of that gā¬ar and $tuff?
Hey, youāre stealing my idea !
Well, i guess you have the funds for a reflector, and i donātā¦
Iām obviously very interested in that project, canāt wait to see more.
On another note:
This aspheric light, am i correct in noticing you blow the cooling air through the Wavien collar?
Arenāt you afraid the surface will get dirty and / or oxidised?
I came up with the idea about 3 years ago, back when I didnāt know anything about flashlight forums.
I got pretty excited when I saw the Uber thrower thread with people that had the same idea as me
Unfortunately it has already been patented, but I guess that means I donāt need to worry about people stealing my designā¦or pay fees every year.
Until now Iāve been sticking to lenses because I thought they were better, but Iām kinda hitting a wall, and the chromatic aberration I discovered in this thread makes me not like lenses as much anymore.
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Yes, most of the airflow goes through the collar.
Thanks to the mesh at the back of the flashlight I donāt have to worry about large particles or insects getting inside the light or on the collar.
Some dust does settle, but very little since it is a very smooth surface and almost nothing sticks to it, the air just pushes right past.
Not really worried about it oxidizing, cold mirror coatings are pretty resistant to oxygen environments.
The reason I wanted lots of air flowing past the collar is to keep it from fogging up in high humidity environments, and water on it would almost certainly damage the coating.
How can one patent a parabolic mirror reflecting light in one direction?
Thatās sillyā¦
Yeah, of course it wasnāt āmy ideaā, i think it must have been invented discovered within a week of the invention of the āopen air arcā electrical light (thatās on 200+ Volts with 2 carbon rods and a big shunt resistor that can heat up a roomā¦)
But i.m.o. an LED begs for a recoil light, since it emits light only one way, in a 120Ā° cone, more or less.
I assume youāll be using a beam or cross made of heat pipes?
Looking forward to your reports.
Yeah, the rainbow / prism effect is always there with an aspheric.
This is why i was wondering about monochromatic light, like 580nm yellow.
I guess you could use a multi lens set up like cameras do, to avoid it? Complex and expensive of courseā¦
There was also another one that I canāt find again right now.
Itās not just a reflector that is patented, but the invention of a reverse facing LED + parabolic reflector + cooling and housing design.
Itās basically an entire product.
Iāll talk about LED cooling when I start the build log.
First Iām applying for funding from my university.
Achromatic lenses are extremely expensive, and would need to be custom made even for the 120mm size of the optofire.
I want to go bigger, but lenses about 6-12ā in diameter would simply be impossible to either produce or afford.
Also, there will always be some chromatic aberration and spherical aberration no matter how precise the aspheric lenses are.
Since a parabola is an easily defined mathematical shape it is a lot easier to manufacture reliably and more ideal for light collimation
Most patents are really just that, a combination of different technologies.
There are different types of patents, and itās perfectly fine to take several other things and combine them into a new device that does something
Reflector will be 11ā diameter.
I wanted to go with 12ā for even more lux but there are several logistical issues which I will probably just avoid completely by going with 11.
According to my calculations 11ā should be enough to pass the maxabeam, which is my upcoming goal