http://www.opencircuits.com/api.php?action=feedcontributions&user=24.3.6.208&feedformat=atomOpenCircuits - User contributions [en]2024-03-29T12:09:25ZUser contributionsMediaWiki 1.34.2http://www.opencircuits.com/index.php?title=POV_display&diff=5075POV display2007-07-04T12:44:11Z<p>24.3.6.208: </p>
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<br />
[[User:DavidCary]] is building yet another "POV display".<br />
<br />
I plan on putting a few features into my display that I haven't seen in any other so far:<br />
<br />
* bright blue LEDs (even though blue is usually the most expensive color ... although sometimes "true green" is even more expensive than blue).<br />
* no slip rings -- just pumping energy across an air gap<br />
* ... and a few other features that I'm keeping hush-hush.<br />
<br />
I want lots of lumens.<br />
Unfortunately, when I go to pick LEDs out of the catalogs, they're not<br />
rated in lumens, they're rated in candelas.<br />
<br />
Is it even possible to estimate "lumens" from the catalog information?<br />
<br />
Do you know what the difference is? Does your flashlight really<br />
produce 10 times the light ( in lumens)? Or does the flashlight merely<br />
focus its light on a tiny spot, so that that spot gets 10 times as<br />
many candelas ?<br />
<br />
For example, check out these 2 LEDs:<br />
$8.75 SSP-LX6144C7UC : 4000 mcd at 120 mA<br />
$8.75 SSP-LX6144D7UC : 1800 mcd at 120 mA<br />
<br />
From the mcd rating, it appears that the first one is more than 2wice<br />
as bright -- and it is, if you're directly in front of it when you<br />
look at it.<br />
However, if you're even the tiniest bit off-center, the second one is<br />
much brighter -- in fact, the total lumens that second LED puts out<br />
(2500 mlm) is slightly more than the total lumens than the first one.<br />
If you diffuse the light and try to light up a whole room with an<br />
array of them, the second one will make the room brighter.<br />
<br />
I'm currently planning on using these in my first POV display:<br />
* $1.32 Telux TLWB7900 : blue : 330 mlm, 231 mcd at 50 mA. (price in ones from http://Newark.com/ )<br />
<br />
Other LEDs I considered using in my POV display (and may re-consider for my next one):<br />
<br />
* $18.89 "Lamina light engine" BL-22B1-0140 : 22000 mlm at 420 mA. (this price includes the required heat sink -- price in ones from http://Digikey.com/ ). This has the most lumens per dollar I've found so far (for blue LEDs).<br />
* $8.750 Sunbrite LuxLEDs SSP-LX6144D7UC blue: 120 mA, 2500 mlm, 1800 mcd (Odd that the red Sunbrite LuxLEDs are cheaper at Newark, the other colors cheaper at Digikey.) cheapest $/lumen blue LED, except for the "light engine"<br />
* $2.550 Lumex "DSP LED" 67-1876-ND: blue, 5 mm, 2500 mcd ( DigiKey ) apparently have some kind of internal chip. All colors run at 2.0 V nominal (1.5 V minimum) (rather than running on current like most LEDs. unfortunately, the data sheet doesn't suggest how much current they take -- I presume more than 20 mA).<br />
* $1.600 Sunbrite "based LED" SSP-01TWB7UWB12 (441-1007-ND) blue 10 mm 20 mA 7000 mcd<br />
* $5.980 GM5WA06270A SMT RGB (35 mA red, 35 mA green, 35 mA blue) 3000 mcd (full color range -- apparently used for digital camera flash ?) (Digikey)<br />
<br />
Spoke-POV and propeller clocks links:<br />
<br />
* An entire discussion forum devoted to POV displays http://www.ladyada.net.nyud.net:8090/forums/viewforum.php?f=11<br />
** In particular, lots of nice pictures http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?p=4712<br />
** 'no-microcontroller-programmer-needed' minipov http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?t=32<br />
* LEDtoy on Sourceforge http://ledtoy.sourceforge.net/<br />
* Ian’s Spoke POV http://www.ianpaterson.org/projects/spokepov20050704/index.htm<br />
* "Propeller Clock" Mechanically Scanned LED Clock: by Bob Blick http://www.bobblick.com/techref/projects/propclock/propclock.html (I think this is the original)<br />
* micro POV display http://positron.org/projects/mpov/ small enough for "glueing it to my shaved head."<br />
<br />
----<br />
<br />
Is this http://led-display-and-design-swicki.eurekster.com/ relevant?<br />
<br />
I think so--[[User:71.234.233.163|71.234.233.163]] 18:06, 22 June 2007 (PDT)</div>24.3.6.208