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Thread: Toshiba yellow 10mm 23,000 mcd LED ?

  1. #1

    Default Toshiba yellow 10mm 23,000 mcd LED ?

    Has anyone tried this one?

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    Has anyone tried this one?<HR></BLOCKQUOTE>

    Where did you see that LED?

  3. #3

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    www.hosfelt.com ...click on led`s...scroll to bottom
    they also have a 10mm white for $5.99

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    www.hosfelt.com
    they also have a 10mm white for $5.99
    <HR></BLOCKQUOTE>
    I sure can't recommend that
    particular LED, cos I bought one and it's output was SUPER disappointing... [img]images/icons/frown.gif[/img]

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    Has anyone tried this one?<HR></BLOCKQUOTE>

    I might have a bag of these... let's see...

    Let's see... Hosfelt # 25-342...yup that's the one.

    The beam is square in shape, very narrow with a darker spot in the center.

    Taking picture... click!
    Downloading...renaming...moving...cropping...uploa ding...

    In this picture, the LED was fired at the target from 3 FEET, so you can see its beam is very narrow. That is one reason why its candela rating is so high.

    At 30mA drive current, my meter says 23.2 foot-candles in intensity. For this measurement, the LED was fired at the sensor (the diamond-shaped thing in the picture) from 12" away.

    Hope this helps.

  6. #6

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Ok, I`m afraid to try the white because of the high price

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
    I sure can't recommend that
    particular LED, cos I bought one and it's output was SUPER disappointing... [img]images/icons/frown.gif[/img]
    <HR></BLOCKQUOTE>

    I can't recommend their 10mm white either.
    I've got a bag of those things, and I can't give those fu$&^@%#ers away! [img]images/icons/mad.gif[/img]

  8. #8

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Thanks Craig, it does not look to impressive...gee...you really do have a museum their...umm you wouldn`t happen to have the white 10 mm would you?

  9. #9

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    LOL, your ahead of me...must be that ESP

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    Thanks Craig, it does not look to impressive...gee...you really do have a museum their...umm you wouldn`t happen to have the white 10 mm would you?<HR></BLOCKQUOTE>

    Yeah... I've got a whole bag of those things. [img]images/icons/blush.gif[/img]
    I'll go look for them. I think they got buried in the you-know-what, but I have a good idea of where to start looking. [img]images/icons/grin.gif[/img]

  11. #11

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Thats ok Craig, I`ll take your word for it...probably narrow with that square shape...thanks Craig and Doug

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    Thanks Craig, it does not look to impressive...gee...you really do have a museum their...umm you wouldn`t happen to have the white 10 mm would you?<HR></BLOCKQUOTE>

    I couldn't find the bag, but I had my original pair of evaluation specimens in a plastic case.


    Picture was deliberately underexposed to try and capture the distinctly bluish center.

    In reality, the beam consists of an elliptical central hot zone, bright cyan in color, surrounded by a much weaker, white coma. It looks like a comet without its tail.

    Measured 10.6 foot-candles from the distinctly bright cyan central beam area.

  13. #13

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Thanks Craig, I can see that new meter is going to be handy [img]images/icons/wink.gif[/img]

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by telephony:
    I couldn't find the bag, but I had my original pair of evaluation specimens in a plastic case.



    Measured 10.6 foot-candles from the distinctly bright cyan central beam area.
    <HR></BLOCKQUOTE>
    I can't show you a picture of mine yet, but it measures only 9.5 footcandles.. [img]images/icons/frown.gif[/img]
    Btw-Craig, do you know whether Nichia or Toshiba makes that 10mm wht.?

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:

    I can't show you a picture of mine yet, but it measures only 9.5 footcandles.. [img]images/icons/frown.gif[/img]
    <HR></BLOCKQUOTE>

    How do you measure yours?
    Do you fire the LED directly into the sensor from a foot away, or some other way?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>
    Btw-Craig, do you know whether Nichia or Toshiba makes that 10mm wht.?
    <HR></BLOCKQUOTE>

    I believe Toyoda Gosei made that one, but I cannot say with absolute, 100% certainty.

    I can tell you that Toshiba isn't (or wasn't) in the white LED racket when these things were made, and the design of the internal leadframe is not Nichia.

  16. #16

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    How many foot candles does...say a Photon with new batts show from 1 foot away Craig or Doug?

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    How many foot candles does...say a Photon with new batts show from 1 foot away Craig or Doug?<HR></BLOCKQUOTE>

    Let's find out... it starts at about 27 foot-candles, and quickly drops like a bomb, even though you can't observe the difference with the eye.

    It quickly sinks to about 20 foot-candles, then falls much more slowly after that.

  18. #18

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Doug, does your`s show about the same?...Craig, how many does the Arclight show?

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    Doug, does your`s show about the same?...Craig, how many does the Arclight show?<HR></BLOCKQUOTE>

    about 18.4, and it stays there instead of sinking.
    This is about like a Photon after 1 minute.

  20. #20

    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Thanks Craig, I wish CMG would up the step-up in the infinity to the Photon level...that would be ideal.

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    telephony-
    That 10mm Wht. LED output was measured w/newly acquired G.E. Lux/footcandle meter-(LED carefully aimed in jig-12" over the meter's sensor).
    Ken-my Photon II output measurements came out very similar to telephony's..
    Btw-when the Arclight is delivered, I'll post a condensed
    direct light unit output-with % light loss hour by hour...

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
    telephony-
    That 10mm Wht. LED output was measured w/newly acquired G.E. Lux/footcandle meter-(LED carefully aimed in jig-12" over the meter's sensor).)
    <HR></BLOCKQUOTE>

    Ok, I just wanted to see if you tested the same way I do - by firing the light directly at the meter. If everyone could get their hands on a foot-candle meter, no matter how old or new, we should all be able to get similar results.

    My sensor is bolted to the wall below my test target, and I just lay the lights on a magnet mount clip that fits a 3 AA Trek light, that is itself placed on a styrofoam block. The whole mess is then rotated & aimed at the sensor. Laying the light onto this clip allows for adjustments to be made, and places the light at the same height as the sensor. Crude, but it works in leiu of a jig or an optical bench. [img]images/icons/blush.gif[/img]

    An LED that needs to be tested is simply held in the hand by the alligator clips that feed it power, and aimed at the sensor and slowly waved about until the highest reading is obtained.

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
    Doug, does your`s show about the same?..<HR></BLOCKQUOTE>
    Ken-
    I just did a"quickie" test on my Photon II-(WHT) with fresh batteries.
    FYI-Initial Lux-Unit brightness was 350 units.
    Test was stopped exactly 2 minutes later, and unit brightness had declined to exactly 250 units!-this obviously means that in 120 sec.
    this great little light lost almost 29% of it's initial brightness [img]images/icons/frown.gif[/img]
    As telephony said, -it falls off
    REAL quickly..(if you really measure it)...........
    What do you imagine the loss would be if I left it on for 10 minutes straight???
    Also-FYI-Photon was reactivated after 2 minute "rest" and the unit reading shot right back up to 345 units!
    -food for thought............. [img]images/icons/smile.gif[/img]

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
    I just did a"quikie" test on my Photon II-(WHT) with fresh batts
    FYI-Initial Lux-Unit brightness was 350 units.
    Test was
    stopped exactly 2 minutes later, and unit brightness had declined to exactly 250 units!-this obviously means that in 120 sec.
    this great little light lost almost 29% of it's initial brightness [img]images/icons/frown.gif[/img]
    <HR></BLOCKQUOTE>

    All of the coin cell, direct-drive lights will show a very quick fall off, which then slows or plateaus a bit as the battery voltage sags & LED current demand decreases.

    Obviously, the larger the battery, the slower the fall off.

    I measured my Photon II at 26,000 to 27,000mcd, which falls extremely rapidly (100mcd per second or more)... within about a couple of minutes it's gone down to 14,970mcd. Then the fall-off slows to maybe 15-20mcd a second... 14,040mcd... 13,430mcd... 13,260mcd...etc.

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Craig, this is Exactly why lots of people wish LRI had gone with the #2032 cells..your thoughts??

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    P.S.

    For those with light meters capable of reading in foot-candles, to convert that to millicandelas or mcd - the standard measurement used for LEDs, do the following:

    With the sensor exactly 1 foot from the LED (or better still from
    wherever the rays are diverging from, and such point will usually but not
    necessarily be somewhere inside the LED), candela and footcandles are
    equal. Multiply foot-candles by 1000 to get millicandelas if you are
    satisfied that the effective distance from the light source is 1 foot.

    I had to do a bit of checking around to confirm what I already knew - that mcd values would easily come out of foot-candle values, and received that confirmation this evening. I had to be sure first.

    So if your physical measurement is reasonably accurate, your light measurement will also be so. And the conversion is so easy... [img]images/icons/grin.gif[/img]

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
    Craig, this is Exactly why lots of people wish LRI had gone with the #2032 cells..your thoughts??<HR></BLOCKQUOTE>

    At 6 volts total, a pair of CR2032 might, just might have enough energy to deliver the fatal blow to an LED connected directly to them.

    The CR2016's won't do it because they can't deliver a couple hundred mA to the LED.

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by telephony:
    At 6 volts total, a pair of CR2032 might, just might have enough energy to deliver the fatal blow to an LED connected directly to them.

    The CR2016's won't do it because they can't deliver a couple hundred mA to the LED.
    <HR></BLOCKQUOTE>
    Have you tried (like I did) that
    xperiment with 2-2032s hooked up to a Nichia "5600"?-didn't notice any problems (only left it connected for about 45 min.), but didn't take any measurements though.........

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by videocal:
    [QUOTE]
    Have you tried (like I did) that
    xperiment with 2-2032s hooked up to a Nichia "5600"?-didn't notice any problems (only left it connected for about 45 min.), but didn't take any measurements though.........
    <HR></BLOCKQUOTE>

    Sorry, I haven't tried.
    I don't have any CR2032's here with which to try it - I lost all of my coin cells in the quake due to immersion in water from a broken fishtank.

    Good instant project: someone who has these things hook up a white LED to a pair of them and meter it for current.

    Most important reading is when the LED first comes on... if it spikes much over 130mA to 150mA during the first few seconds, it will probably shorten the LED life quite dramatically, and some LEDs (not all) may even blow out at this point.

    Yours may have worked, but that doesn't mean everyone else will be as lucky. [img]images/icons/blush.gif[/img]
    Then again, if the current on NEW batteries stays below 120mA or so, there may not be a problem with using this larger cell size.

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    Default Re: Toshiba yellow 10mm 23,000 mcd LED ?

    Additional point of interest(?)
    Just did output longevity experiment with Pelican L1.
    Initial output=340 units
    Aft.2 minutes=300 units
    " 5 minutes=295 units
    " 10 minutes=285 units
    " 15 minutes=277 units
    " 30 minutes=255 units
    -hey, this could be Addictive,-I think I'll quit while I can... [img]images/icons/grin.gif[/img]
    p.s:batts were thoroughly
    pre-checked B/4 doing that.
    (4-L.R.44s)

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