SureFire L4 uv-vis microspectrophotometer results
- Thread starter glen
- Start date
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The_LED_Museum
*Retired*
My spectrometer is broken, so I probably won't be graphing LEDs or flashlights anymore. Not anytime soon, anyway. /ubbthreads/images/graemlins/jpshakehead.gif I'm glad *somebody* else here has access to one. /ubbthreads/images/graemlins/grin.gif
(The charts are nicer than the ones my spectrometer created, too!) /ubbthreads/images/graemlins/smile.gif
(The charts are nicer than the ones my spectrometer created, too!) /ubbthreads/images/graemlins/smile.gif
annomundi
Newly Enlightened
The visible spectrum is between 400 and 700nm, and green is i'm guessing 515nm, so does the spike at 430nm balance the red shifted bigger spike to make the eye believe it is seeing white? It seems the green is winning for this L4. How do others read the graph? Do the two spikes represent two diffrent phosphors? Dierik
Entropy
Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
[ QUOTE ]
annomundi said:
The visible spectrum is between 400 and 700nm, and green is i'm guessing 515nm, so does the spike at 430nm balance the red shifted bigger spike to make the eye believe it is seeing white? It seems the green is winning for this L4. How do others read the graph? Do the two spikes represent two diffrent phosphors? Dierik
[/ QUOTE ]
The big bump is the phosphor. The blue spike is the LED itself. (White LEDs are phosphors excited by a blue LED.)
[ QUOTE ]
annomundi said:
The visible spectrum is between 400 and 700nm, and green is i'm guessing 515nm, so does the spike at 430nm balance the red shifted bigger spike to make the eye believe it is seeing white? It seems the green is winning for this L4. How do others read the graph? Do the two spikes represent two diffrent phosphors? Dierik
[/ QUOTE ]
The big bump is the phosphor. The blue spike is the LED itself. (White LEDs are phosphors excited by a blue LED.)
dlee96
Newly Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
Here are two more spectrometer results.
This one is a little green. KL4#A00092
This one is a little purple. KL4#A05277
Here are two more spectrometer results.
This one is a little green. KL4#A00092
This one is a little purple. KL4#A05277
dlee96
Newly Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
If interested i can post more graphs of an A2 white led and the incan.
-dlee
If interested i can post more graphs of an A2 white led and the incan.
-dlee
PaulW
Flashlight Enthusiast
Re: SureFire L4 uv-vis microspectrophotometer resu
Dlee,
Yes, please do the A2. Thanks.
Paul
Dlee,
Yes, please do the A2. Thanks.
Paul
annomundi
Newly Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
So it seems like it's a balancing act between the amount of light escaping from the blue led and the phosphorescene that makes the led appear to be white. It must be difficult to balance these two effects to produce white light. I guess this is why it is such a lottery when you buy one of these lights. What do you think?
So it seems like it's a balancing act between the amount of light escaping from the blue led and the phosphorescene that makes the led appear to be white. It must be difficult to balance these two effects to produce white light. I guess this is why it is such a lottery when you buy one of these lights. What do you think?
Canuke
Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
Part of the issue is the balancing act, and part of it is the uneven distribution of wavelengths. I've noticed that the color variance described here -- greenish, bluish and purplish as well as white -- can be seen in mercury vapor lamps also. I've sen blue, white, purplish and greenish ones... in fact, I found one just tonight that had the exact same color as my L4... just a hint of bluish-green.
Part of the issue is the balancing act, and part of it is the uneven distribution of wavelengths. I've noticed that the color variance described here -- greenish, bluish and purplish as well as white -- can be seen in mercury vapor lamps also. I've sen blue, white, purplish and greenish ones... in fact, I found one just tonight that had the exact same color as my L4... just a hint of bluish-green.
dlee96
Newly Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
If you are referring to the counts measure on the y axis as a measurement of light escaping, please disregard that. The L4 was so bright it easily went off the scale so I had to kinda angle it away from direct exposure to the sensor. Yeah, the counts maximum don't mean nothin' in this case.
-dlee
If you are referring to the counts measure on the y axis as a measurement of light escaping, please disregard that. The L4 was so bright it easily went off the scale so I had to kinda angle it away from direct exposure to the sensor. Yeah, the counts maximum don't mean nothin' in this case.
-dlee
LEDmodMan
Flashaholic*
Re: SureFire L4 uv-vis microspectrophotometer resu
Overall though, all these graphs DO look a lot like what LumiLeds claims as an output spectrum for their LS's.
Overall though, all these graphs DO look a lot like what LumiLeds claims as an output spectrum for their LS's.
dlee96
Newly Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
Here are the A2 white led and incan charts.
White LED's
Incan
I'll post more as I acquire more LED lights. Maybe the KL5-8
-dlee
Here are the A2 white led and incan charts.
White LED's
Incan
I'll post more as I acquire more LED lights. Maybe the KL5-8
-dlee
Canuke
Enlightened
Re: SureFire L4 uv-vis microspectrophotometer resu
Interesting, the "white LED's" in the last ones lack the 620nm or so red spike that was present in the Luxeons.
Interesting, the "white LED's" in the last ones lack the 620nm or so red spike that was present in the Luxeons.
The_LED_Museum
*Retired*
Re: SureFire L4 uv-vis microspectrophotometer resu
Nichia white LEDs (which I believe are the kind used in the A2) are known for not having that reddish-orange spike
that Luxeons have.
Here's a spectrum I took of a Nichia NSPW500BS white LED I took with my spectrometer when I first got it.
The "hump" at 700nm can be ignored.
Note the blue spike around 465nm; this is the actual blue chip that the phosphor is applied to.
I also have a program that gets rid of that 700nm hump, but my spectroscope is now broken, so I can't use it anymore.
Nichia white LEDs (which I believe are the kind used in the A2) are known for not having that reddish-orange spike
that Luxeons have.
Here's a spectrum I took of a Nichia NSPW500BS white LED I took with my spectrometer when I first got it.
The "hump" at 700nm can be ignored.
Note the blue spike around 465nm; this is the actual blue chip that the phosphor is applied to.
I also have a program that gets rid of that 700nm hump, but my spectroscope is now broken, so I can't use it anymore.
