John Popelish wrote:
> dagmargoodboat@yahoo.com wrote:
>
> > I finally dug out (and through) my notebooks for this data from 2001:
> >
> > 3/14/2001
> > Short-circuit photocurrent of some random,
> > junk-box devices, 1.5m from a 50w halogen
> > flood lamp:
> >
> > LEDs
> > green, bright 3mm, Hosfelt 25-302 <0.02uA
> > IRLED, unknown vintage (90's?) 4.3uA
> > old red LED 0.10uA
> > IRLED, 1970's 0.11uA
> > IRLED, Optek OP232W (TO-18) 0.2uA
> > red, ultrabright, 5mm, narrow beam 4.3uA
> > IRLED, 1997, super bright 3.4uA
> >
> > yellow, 5mm, ultrabright, Hosfelt 25-335 0.88uA
> > green, 5mm, ultrabright, Hosfelt 25-366 0.72uA
> > yellow, 10mm, low efficiency 0.08uA
> > green, 3mm, bright 0.08-0.11uA
> > red, 10mm, ultrabright 2.2uA
> > green, 5mm 0.17uA
> > red, 2mm, Dialco 555-2003 0.13uA
> > red, ultrabright, 5mm 3.6uA
> >
> >
> > PIN photodiodes
> > PN323BPA (Panasonic?) 26uA
> > TIL413 57uA
> >
> > large area photodiode, ~2.5x2.5mm 12.8uA
>
> Would you please add whether the epoxy on the various LEDs was clear,
> frosted or dyed a color?
Sure.
Please note that these were *crude* measurements taken
five years ago, just to see the range of outputs that
might be expected from good & bad photogenerating LEDs.
I wasn't trying for ultimate rigor. The 1.5m lamp
spacing, for example, is an estimate. The X-Y-Z location
of the device tested in the (uneven) illumination
field is critical, and the angles even more so. I chose
the combination producing max. photocurrent in each case.
That said, ...
First, let's measure the spacing to the lamp: 1.54m,
so 1.5m was not a bad guess.
Next, check our calibration with an identifiable type
measured 5 years ago:
red, 2mm, diffused, Dialco 555-2003 (unit #1) 0.13uA
red, 2mm, diffused, Dialco 555-2003 (unit #2) 0.11uA
Okay, so we're in the ballpark.
Now that I'm calibrated, I can use my recollection for
device-identification wherever possible, and have
the old data for sanity-checking / confirmation of ID...
Here's an updated table, with as much info on each
LED as I can ascertain, plus a few new entries...
'-------------------------------------------
Short-circuit photocurrent of some random,
junk-box devices, 1.54m from a 590l, 50w halogen
lamp:
LEDs
green, 3mm, clear light green tint, bright <0.02uA
(Hosfelt 25-302)
IRLED, 5mm, unknown vintage (90's?) 4.3uA
old 5mm diffused red LED, 1970s 0.10uA
IRLED, circa 1970s 0.11uA
IRLED, Optek OP232W, clear (TO-18) 0.2uA
red, ultrabright, 5mm, clear, narrow beam 4.3uA
IRLED, 1997, super bright 3.4uA
yellow, 5mm, ultrabright, clear, Hosfelt 25-335 0.88uA
(Toshiba TLYH180P 590nm 8cd, 8deg beam)
green, 5mm, ultrabright, clear, Hosfelt 25-366 0.72uA
yellow, 10mm, low efficiency, diffused 0.08uA
green, 3mm, bright 0.08-0.11uA
red, 10mm, ultrabright 2.2uA
green, 5mm 0.17uA
red, 2mm, diffused, Dialco 555-2003 0.13uA
red, ultrabright, 5mm 3.6uA
PIN photodiodes
PN323BPA (Panasonic?) 26uA
TIL413 57uA
large area photodiode, clear, ~2.5x2.5mm 12.8uA
'-------------------------------------------
New measurements:
orange, 10mm, clear 3.12uA
red, 5mm ultrabright, 20deg (est.) beam. 2.01uA
red, 5mm ultrabright, 20deg (est.) beam. 4.14uA
IR, 5mm, clear, est. 10 deg. beam 7.85uA
red, 2mm, diffused, Dialco 555-2003 0.13uA
red, 2mm, diffused, Dialco 555-2003 0.11uA
yellow, 5mm, clear, Infineon LY-5436 0.17uA
(700mcd, 591nm, 20deg.)
Cheers,
James Arthur