The lumens decrease, as I already proved. (Using my light meter)
DL, the meter measures light intensity(lux), NOT brightness(lumens). Please understand this. Misusing terms is why everybody is confused.
When you read the number being higher, it means simply light is more intense/concentrated. Measuring straight from the front, you get much higher number, that number shows light is more focused and concentrated on smaller spot. This is lux.
As you mentioned, measuring light bounce give same number on the meter, with and without. That is expected, as ceiling bounce scatter the light and average out the intensity.
Seriously though, a few members already explained straight in this thread and I don't think you're even trying to understand them. Lumens is NOT lux. I understand what you're saying, but using different "language" and "terms" simply won't get points across.
here we go again at this Lux and lumens thingie… for one thing, you’re right about me not even trying to understand them.
as i will mention it again… and again… this mod is not about them lux or lumen.
is about* an idea *how to make cheap flood flashlights throw farther than they normally could.
maybe i’m making a mistake in the beginning mentioning about brightness as some people confused at what’s the meaning of brighter.
to some people like you…the meaning of brightness have to be scientifically measured in lumens or lux.
and to some people like me and others who don’t give a crap regarding the lumens or lux, we judge it by our own eyes…
if the pictures shows it’s brighter than before… then it is… as simple as that.
if what i did simply manipulating beams of light into tighter beam so it can throw farther than before… then that’s it, that’s the goal for me.
and to others like me…we don’t care about what parallel beams is, or how much lumens lost in the process…
all we know is that darn thing can throw farther than before. make that a lot farther 
like i said before… maybe your point of view of what’s consider brighter is different than on what my point of view of what brighter is…
but unfortunately some people like you tend to get lost in the moment and rather enjoying debating on the issues of what can be consider the term of brightness, and failed to see the bigger picture here.
it is about* sharing ideas * it is not about trying to get points cross,it is not about convincing other people that they should believe in my mod.
it’s a simple mod build for the fun of it… that’s all about… FUN 
Anything that is trying to increase throw is about lux...
lol…give it up already scaru 
DL, why are you so determined that you don't want to learn about the correct terminology? Imagine you wanted to discuss car motors and someone would constantly confuse horsepower and torque... At some point, you'll not only confuse members, you'll irritate them.
DayLighter I’m with you. Many here has not read (or understood) what I pointed at in post #24.
Not that it is easy stuff, It took me years to comprehend it (I was ten years in an optical lab as a software developer).
What you did was to focus the beam better and as a result you have a brighter hotspot as you say. Simple as that.
Brightness has little to do with total output and is a physiological, unlinear unit. Just as you say, does this look brighter than that?
Think of this experiment: You light up a wall with your light and have a bright hotspot on the wall. You take a dark cloth to the wall and block half of the hotspot.
The result is that the remaining hotspot has exactly the same brightness as before althougt you blocked half of the lumens out.
Brightness is an unlinear function of an objects Luminance. The Luminance of the object (here the hotspot on the wall) is the difficult thing to understand. It is measured in candela per square metre.
Bicycle lights are often measured in Candelas (which is lumens per unit of solid angle - Half a sphere covers about 6 units of solid angle).
Think of the hotspot as a collection of houndreds of tiny bicycle lights that shine in your face, each with the intensity of 1 lumen per unit solid angle.
The luminance (and hence the brightness) is then how many of these tiny lights there are per square meter.
(Not easy stuff to explain either).
Wow.
Concept, I was thinking would increase brightness shown here, and done before I could try it
It’s nice to see people chime in and actually explain “torque and horsepower” of the flashlight. I UNDERSTAND it now!
sigh… i wish you guys woud give up on this issues regarding brightness or lumens.
i’m not trying to be an ignorant A…hole regarding the brightness or lumens…
you guys are killing me here…
what i’m trying to do is just to show a simple experiment that maybe someday somebody could take it further to improve it.
i already change the subject from brighter to longer throw… and i did shows just that…so what’s the big issue here?
it’s like asking which one is brighter… Skay Ray king or Thrunite TN31?
i’m pretty sure everybody have different opinion on this too.
i think this debate started with ma_sha1 post #12:
Long focal length magnifier lens can focus the beam to the wall & make the spot very bright, 10x brighter easily, but this diverge the beam and thus reduce flashlight throw.
In this case, greatly increased lux on the wall = greatly decreased throw!
This is like playing with magnifying glass to focus sun light, the focused spot is strong enough to ignite fire, but +will no longer throw long distance.
+
well guess what? i proved him wrong, how could you increase the lux but suffer decrease in throw?
do i need to change the subject to increase the lux and longer throw from simple light instead?
does that will make people happy here?
i guess only Old lumen post #34 says it better than anyone here…
No…
You don’t understand. If it can’t be dissected, corrected, manipulated, stipulated, debated, rejected or accepted, it can’t be discussed in a flashlight forum.
Yes, you redirected the light and it appears brighter, because it is more focused. No, it really isn’t brighter scientifically, because optics cannot increase light output. They are all just going through their usual long BLF process, let them enjoy, they can’t help it.
As for me, I think it’s a pretty cool attempt at focusing the light from your flashlights into a more usable beam. Not everyone knows the scientific correctness and the reality is “It’s just a flashlight for * sakes and it’s just a hobby, not building a rocket here, LOL. Have fun with it.
You proved him wrong in regard to flood lights, anything with a decent sized reflector will not benefit from this as shown by my experiment. It was brighter on the wall with the fresnel lens, but did not throw as far. That is quite clear.
Didnt even work on my P60. So I dont know what kind of lights could benefit. Cheap aspherics?
it still can be done, however you might need different size of magnifying glasses, something that i currently don’t have nor i can’t find a big one as in 10” diameter… check your post regarding that 10” diameter monster thrower.
I was using a 8.5 inch by 11 inch fresnel lens. It was plenty big...
Peace Daylighter, my post #177 was aimed at your opponents!
yeah it doesn’t really work well with thrower… only works very well with flooder light
Ok, so you admit you didn't prove ma_sha wrong?
I’m going to pile on mister know it all here. Sorry fella, YOU are totally incorrect. Do your experiment accurately and you will find out the times are NOT the same. By putting your finger over the hose you introduced a restriction to the flow so the actual flow goes down. The only way you can maintain the same flow in the restricted line is to increase the pressure.
There are no opponents, just people wanting to clarify terminology and what was done.
If you use a magnifying glass to focus sunlight, you have greatly increased lux at the focus point, but past that point the beam will disperse and not stay focused. I think that is the clarification people want to get across.
nope… i’m still stand on my statement, with flooder lights that i’m testing… it’s definitely will not loss in throw distance, in fact it increase by many times fold, HOWEVER… using throw flashlight… it doesn’t works as well as flooder light…maybe because the way the reflector beams out the light?
i don’t know i’m not a light engineer. but it is only prove it only works well with flooder lights only…
i’m still trying to find a way to increase the throw using thrower light. that’s why it’s called prototype
Ok, so you stand by your statement that ma_sha was wrong when he said
Even though you said.
You have contradicted yourself.