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Old 09-14-2012, 11:05 PM #1
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Question Focusing Flashlight Beam?

Hey all, I was just thinking about how to focus a flashlight beam into a tighter line while preserving the light at the same time. Lenses or something like that a good idea?


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Old 09-15-2012, 05:44 AM #2
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Default Re: Focusing Flashlight Beam?

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Originally Posted by swimrocks495 View Post
Hey all, I was just thinking about how to focus a flashlight beam into a tighter line while preserving the light at the same time. Lenses or something like that a good idea?
You can focus it to a tighter line but not the same as a laser.

Laser has single wavelength while flashlight produce light with many wavelengths. each wavelength will probably focus different because of different speed.

If I'm wrong then please correct me guys, I'm not sure about this.

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Old 09-15-2012, 10:41 AM #3
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Default Re: Focusing Flashlight Beam?

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Originally Posted by swimrocks495 View Post
Hey all, I was just thinking about how to focus a flashlight beam into a tighter line while preserving the light at the same time. Lenses or something like that a good idea?
Using a better focusing reflector?
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Old 09-15-2012, 01:30 PM #4
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Default Re: Focusing Flashlight Beam?

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Originally Posted by swimrocks495 View Post
Hey all, I was just thinking about how to focus a flashlight beam into a tighter line while preserving the light at the same time. Lenses or something like that a good idea?
I believe an aspheric lens does what you want. like this one but which is out of stock
PRECISION PCX ASPHERIC LENS 50MM DIA, 35MM FL - Surplus Shed
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Old 09-15-2012, 05:15 PM #5
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Default Re: Focusing Flashlight Beam?

Ask the flashlight guys.

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Old 09-16-2012, 06:24 PM #6
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Default Re: Focusing Flashlight Beam?

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Originally Posted by Thejoker301 View Post
You can focus it to a tighter line but not the same as a laser.

Laser has single wavelength while flashlight produce light with many wavelengths. each wavelength will probably focus different because of different speed.

If I'm wrong then please correct me guys, I'm not sure about this.

Wrong, different wavelengths have the same speed, which is the speed of light, but different frequencies.

Last edited by hoo7h; 09-16-2012 at 06:25 PM.
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Old 09-17-2012, 02:21 AM #7
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Default Re: Focusing Flashlight Beam?

^Wrong. The speed of light changes depending on the medium it is in. Different wavelengths change speed differently. This is why lenses work. Source.

The different colors are focused differently when it comes to LEDs, but only slightly. This usually comes in the form of a white dot with a slight halo that is either blue or red depending on the focus.
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Old 09-17-2012, 06:59 AM #8
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Default Re: Focusing Flashlight Beam?

And that's why you can see rainbows, can make the light "split" trough prisms...
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Old 09-17-2012, 01:22 PM #9
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Default Re: Focusing Flashlight Beam?

The actual Reason you cant focus an LED is because the emiter on an led is not a point source,
the different colors only play a small role in your inability to focus an led.

An led's emitter is ~1mm
a lasers emitter is like ~10 micrometers, 100,000 times smaller.

Meaning with the same lens, an led will diverge 100,000 times more than a laser
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Old 09-17-2012, 02:04 PM #10
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Default Re: Focusing Flashlight Beam?

Very true.

As a former flashaholic, I can say that there are basically two ways to get near-coherent beams from LED's.

The first is to use an aspherical lens. You can change the beam in this light by moving the lens closer or further from the LED:

X2000 Flood-to-Throw Zooming Glass Optics Cree P4-WC LED Flashlight (1*18650) - Free Shipping - DealExtreme

The second way is to use a huge reflector. Note that LED's with larger area need bigger reflectors to create a coherent beam. Even though an XP-G2 (~480lm) LED produces less lumens than an XM-L (1000lm), it will throw farther because the die size is much smaller than that of the XM-L.

Check this light out:



Located here: MaxaBeam vs. the Moon

The Maxabeam is only 1400 lumens yet blows every single LED or HID light off.

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Old 09-18-2012, 04:17 PM #11
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Default Re: Focusing Flashlight Beam?

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Originally Posted by Cyparagon View Post
^Wrong. The speed of light changes depending on the medium it is in. Different wavelengths change speed differently. This is why lenses work. Source.

The different colors are focused differently when it comes to LEDs, but only slightly. This usually comes in the form of a white dot with a slight halo that is either blue or red depending on the focus.
Wrong again, the speed of light decreases only in the len, once it go out from it, the speed increases again.
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Old 09-18-2012, 06:03 PM #12
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Default Re: Focusing Flashlight Beam?

Medium is another word for material.
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Old 09-19-2012, 07:28 AM #13
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Default Re: Focusing Flashlight Beam?

As prove,
If we put a big number of diamonds in a line, and then we turn the light on, when the light be slow enough so we can see it moving ?

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Old 09-19-2012, 07:57 AM #14
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Default Re: Focusing Flashlight Beam?

Quote:
Originally Posted by hoo7h View Post
As prove,
If we put a big number of diamonds in a line, and then we turn the light on, when the light be slow enough so we can see it moving ?

Cyparagon
You are an ignorant narrow minded person, you gave me a bad rep because you cant replay.
Wrong, you hoo7h, are ignorant and annoying.

You won't see the light moving, cause it has to reach your eyes first! And it can't do that if it is still in the diamonds.

Even if you make a long line of them, you would still need a camera with a lot (few billions?) of frames per sec.

Last edited by Cel; 09-19-2012 at 08:01 AM.
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Old 09-19-2012, 09:40 AM #15
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Default Re: Focusing Flashlight Beam?



Hope the time stamp works. If not jump to 1min 5sec.

Cheers!
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Old 09-19-2012, 10:49 AM #16
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Default Re: Focusing Flashlight Beam?

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Originally Posted by Cel View Post
Wrong, you hoo7h, are ignorant and annoying.

You won't see the light moving, cause it has to reach your eyes first! And it can't do that if it is still in the diamonds.

Even if you make a long line of them, you would still need a camera with a lot (few billions?) of frames per sec.
There is only one guy I trust that can solve this, he almost got an answer to everything, InfinitusEquitas

Lets see his judgment
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