good experiments Daylighter, I for one wasnt interested in your first experiments with that tube thing, only the telescope one, which I have often wondered about that myself. (ok not so often, but i have wondered) The telescope definitely does increase the throw of your 502b. No math on paper in the world can disprove that.
yes… that’s exactly what i’m trying to do 
making decent small flashlights into an awesome thrower
when first time i stuck that Ultrafire WF 502B into that flashlight… suddenly i have that “eureka” moment … why didn’t i think of that kind of moment.
so i’m trying to build it with bigger tube, so i can accommodate more flashlights, and see if it can be use into something fun
as you know, with this hobby… we always want something brighter… throw longer than any flashlights we’d owned but unfortunately our significant others not always too supportive about spending more hard earned $$$ for more flashlights.
and yet… we’re still looking for a way to satisfy our “lumenvy” lust and who doesn’t want a very bright light with Kmart prices? 
the built was crude… but+* it’s the idea *+that i’m hoping for someone who have the tools, resources and skills to build a better one and then share it with the rest of us.
if we can pay around $12 for a flashlight that can out throw Thrunite TN31 someday… who wouldn’t want to have one?
unfortunately some people start taking things too seriously, instead take a look at the idea and say… hey, that’s not bad… let me try build it for my lights too.
so for those people that agree with me on this idea… here’s to you 
DayLighter,
nobody in this thread didn't believe you when you said that your telescope increased the throw of your flashlight. I don't have a telescope, but I don't need one to know that it works.
The cause for all this confusion was that you basically stated in your first post that a fresnel lens turns a floodlight into a monster thrower, and when people doubted that (and even tried to explain it), you posted beamshots of your telescope approach, and that's a completely different situation.
The build and idea is cool but I think he just wants to set the facts straight. Here is what I understand (correct me if I am wrong ma_sha1)
What you have achieved: increasing the focus at a short distance while sacrificing some loss in lumens and possible loss in throw too (depending on how floody/throwy the light was in the first place).
The mods you build neither increase brightness or throw (depending on light, as mentioned before). It focuses the beam at a set point but past that point, the beam will start dispersing because the beams coming out of your device are no longer parallel but rather they are converging (and after the focus, diverging).
To test brightness, you can do a ceiling bounce test.
To test throw, post pictures of beam shots with your mods, not the telescope. Scaru has already done that and shown that it does not increase throw with his lights.
In the end though, you made your floody lights more usable to you by focusing the light which is cool. But I think most people just want to set the fact straights so this mod isn’t misinterpreted as some new lumen enhancing, monster thrower discovery.
just do yourself a favor, use the cheapest flood flashlights that you owned, as i found out using thrower will not do you any good, but nevertheless… the hotspot will appear to be brighter within 30’–50’
if you want to throw as far as my experiment ( 300’ +), you gonna need another concave glass behind that magnifying glass.
have fun…
ps: you don’t really have to wait until dark, if you have one of those cheap flood light, the kind that won’t cast a hotspot past 20 feet away something like one of these lights Tmart AAA batteries flashlights will be perfect for this experiment.
well… the idea of my creation was based on that telescope. i was merely trying to build it bigger so i can accomodate more flashlights.
the built was not perfect, its the idea what i’m selling,hence the prototype… some people just didn’t pay attention to that.
they’re hoping to see well built finished product that can throw monster output.
common sense will tell you… you can’t really turn any flashlight that worth less than $15 into HIDs like thrower.
However… it can turn those cheap flood lights into throwers or at least throw farther than it normally could.
and i’ll stand by that statement.
simply get a magnifying glass and test it yourself… i’m using 2X magnifying glass that i bought from dollar store.
Actually, I am going to change it up. I will go take beamshots at the same location I did for my 300 yard shots. I will be using a 8.5*11 inch fresnel lense along with a Stanley Fatmax XM-L. I am doing it this way so we can have long range shots, which this light is capable of stock; and it will clearly demonstrate that there is less throw.
Adding a concave optic before it is not part of the expirement, as that is not what I am saying will not work. I acknowledge that will work, but a simple fresnel lense will not increase throw. I am positive of that.
Of course I have been there and done that. The problem is, if you want the beam to stay focused you constantly have to adjust the focal length depending on the distance of the target you want to illuminate. And that's not very convenient.
not trying to beat a dead horse here, sorry. But I think what Daylighter is saying, is that you have to use a flashlight that stock DOESNT throw far. Using a light that you says already throws far is pointless and not what what put forth in the OP. If its a stick light that DOESNT throw far already, and you use the Lens, hes saying it will increase the throw. What youre proposing will not be sufficient to prove anything in this regard.
So instead of using a torch that has throw, use one thats all flood no throw. THEN perform your test with the lens and take beamshots. Either way, I apreciate you taking the time to test this theory, i know taking beamshots is somewhat difficult and time consuming.
i still stand by my statement, question is… how far of a throw are you expecting? all i’m saying is… all the light that i’m testing is capable throwing farther than the light itself capable of.
if you’re expecting that Trustfire WF 502B will defeat TN31 or HIDs kind of beam… you’re in for dissapointment…
but if you compare that 502b with something decent like C8… i’ll stand on my statement it can certaintly beat it.
like i said… this is a prototype, not a perfect built… i’m selling* my idea *not my built.
my idea is based on using the telescope kind of device to throw the light more forward. but you guys acted as this is already the final build.
like i said it before and i’ll say it again untill somebody understand this… this is an IDEA that i’m selling, as the prototype will work or not to your liking is another story.
i’m just hoping someone will take this idea and step up and make it a better one, let’s end this for argument sake … it simply works!
if the final shot of over 300’ using a cheap Trustfire Wf 502B can’t convince you… then i have nothing else to say :~
A telescope will certainly work, we never said it wouldn't... Using one lens will not. But ok, I will take some using my triple XM-L drop in. Which is all flood.
either you don’t get it or you refused to accept or you maybe have set the limit too high on this experiment.
like i have said before… using light which have bigger output than that i’m using, beat the purpose of this experiment…
maybe you’re expecting monster throw like HIDs hotspot to satisfy your finding… instead doing a simple light test using the cheapest kind of light to see if my idea works or not.
as far as anybody else want to take up the challenge… i’m still standing on my statement, that using this mod, you can throw farther than you cheap small flashlight can throw.
as far as the brightness in lumens? only some people who has the sphere can tell… anyone with the sphere want to take this challenge?
Ok, I will use a TK35 clone with out the reflector. This means there will be absolutely no optics...
While I do not have a sphere, I can test the output (lumen wise) by placing it in a room and measuring the amount of light. I will do that now.
Ok, without the lens it measured 438 lux and with the lense 299. I'm not sure why I needed to prove this as this is basic science... Nothing is 100% inefficient.
I think you meant efficient…… 
Did you leave the lens out too?
Oops, I fixed it. ;) In this case I left the lens in as it does not matter. It simply compares lens to no lens.
Goodness MEN why all the dispute……You all saw each others points of view but argued over separate topics……
Single asperic lense in front of REFLECTORED flashlight = no worky……
Double lenses in front of REFLECTORED flashlight = Worky quite well……
The first lense is needed to focus all the light into a smaller more focused beam while the second collimate the now equally converged beam into something that will project at a given ratio. Thus eliminating the distant focal point. I am no scientist but this makes sense in my head, likely not all yalls though because I typed what terms I know which may or may not be proper.
Nice experiment DayLighter. You have creative a lively topic of debate. Keep them up.
HOly crap… it’s cold out here tonight and so freaking windy… but in the name of science… i decided to throw another experiement.
this time i’m using another small flood light Ultrafire HD2011 got it from Wallbuys special promotion for $9.99
but this time i’m including light meter at the end of the spectrum. it’s PIA since i have to keep on going back and forth between the flashlight and the meter to take the picture… same distance… about 80’ away and this time to avoid any confusions, i’m going to use my mod instead the telescope
HD2011 before ( notice there’s no hotspot as HD2011 is a flooder light)
the light meter measurement at 80’ away
HD2011 inside the tube
HD2011 beam shot ( notice the hot spot)
HD2011 light meter measurement at 80’ away
SkyRay King at 80’ away
SkyRay king light meter at 80’ away
now you guys can throw all this science about lights at me… but the meter don’t lie, the device is working using just one magnifying glass at the front tube.