Dear Mr Flux ..
I would gladly accept that this is a error in the documentation ...
But I have several doubts still...
1)
(...) This specification applies to AlInGaP metal bonding 42 x 42mil red LED chip, BN-R4242E-A3
( 600-650 nm die ..... typ :625 nm )
Luminous intensity(Iv) : 350mA : 1600 - 13100
mcd =>
5- 41 lm @ 120° <= those numbers seem to stand as true ...
http://led.linear1.org/lumen.wiz
......
It can not be mcd ( 12-40 millicandelas ? => 0.0 something lumens )
2)
If it lumens (12-40 ) ,then that chip has similar efficiency with Osram Oslon Hyper red bin T2 ..
So ,it can't be lumens either ....
3)
(...) This specification applies to AlInGaP metal bonding 42 x 42mil red LED chip, BH-C4242D-A1
(650-680 nm die )
Radiant intensity(I) :350mA : 12-40
mW
4)
Do not give any importance to driving currents on the following document (it refers to small 20mA epoxy leds ).
Read about the semiconductor alloy properties ...
"
Original Visible Red, GaAsP on a GaAs Substrate - These LEDs were the original commercially successful visible type. The working chemistry is gallium arsenide phosphide with an arsenic/phosphorus ratio of around 60-40 by number of atoms, on a gallium arsenide substrate.
The spectral output typically peaks around 660 nm in a band that is unusually narrow for red LEDs. The color is a pure red. The efficiency is horribly low, a few hundredths to around a tenth of a lumen per watt. Most LED lamps using this technology have a maximum continuous drive current of 50 mA and need 20 mA to be reasonably bright, optimistically working OK at 10 mA. The efficiency is maximized at higher currents of 20 mA and up. Typical voltage drop is 1.6 to 1.75 volts. These dimly glow at 1.5 volts.
Low Current Red, GaP -
This was the original high efficiency red LED, which was available as far back as 1976. The chemistry is gallium phosphide doped with zinc oxide. These LEDs are usually impressively efficient (1 to maybe 2 lumens/watt) at low currents of a few mA or less, but are only about 2-3 times as efficient as the original formula red ones at 20 mA. The color varies with current, and is nearly enough pure red at .5-1 mA but more orange at higher currents. If the lamp is not tinted red, the emitted light is usually orange to sometimes slightly yellowish orange at 30 mA.
The spectral output is a broad band, nominally peaking at 697 nm and maybe only peaking that far out in the red at really low currents. There is a secondary spectral band in the green peaking around 550-560 nm which is more noticeable at higher currents. Maximum drive current is usually 30 mA, but these LEDs have noticeably nonlinear light output that increases less than proportionately with current above a few mA. Voltage drop is around 1.9 volts.
Super High Brightness Red, GaAlAsP - These things became available in the mid 1980's. Earlier models with opaque substrates were impressive back then with efficiencies of 1-2 lumens/watt. These have since been improved, with transparant substrates and other refinements. Agilent has a similar chemistry which they call "T.S. AlGaAsP".
The overall luminous efficacy of the best models is about 9 lumens/watt. The spectrum usually peaks between 650 and 670 nm, but some Agilent models peak slightly shorter. The color is pure red to He-Ne laser red, with a dominant wavelength (wavelength of monochromatic light of matching color) usually in the 640's but anywhere from about 635 to about 650 nm. Efficiency is usually maximized at currents near 20 or 25 mA. Efficiency at low currents of around a mA to a few mA is not impaired as badly as it is in many other types that have efficiency peaking near or over 20 mA. Typical voltage drop at 20 mA is 1.8 to 1.9 volts. Maximum rated drive current is usually 30 mA but sometimes 50 mA. These usually glow dimly at 1.5 volts.
High Efficiency Red, Orange Red, and Orange,
GaAsP on GaP substrate - This was the first non-low-current high-efficiency red LED. The working chemistry is gallium arsenide phosphide, with an arsenic/phosphorus ratio around 40-60 on a gallium phosphide substrate. The GaP substrate is transparant to the emitted light and GaAs is not. This is one reason why these LEDs are more efficient than the original formula red ones.
The color is normally orange-red with a dominant wavelength around 620 nm. A slight variation of this has a dominant wavelength usually around 610-615 nm and is considered orange. The peak wavelength is usually around 630 nm. Typical drive current is 5 to 20 mA and maximum current is usually 30 mA. Typical voltage drop at 20 mA is around 1.9 volts.
Ultrabright Orange-Red, Orange, Yellow, and Green, InGaAlP -
The indium gallium aluminum phosphide LEDs came out in the early 1990's. These are usually either red-orange with a dominant wavelength around 610-617 nm, or yellow or "amber" with a dominant wavelength around 590 nm.
Dominant wavelength can be as low as the 550's of nm ("pure green" or "emerald green", yellowish green but less yellow than usual for LEDs) and as high as the low 630's (He-Ne laser red).
The most efficient ones are usually orange to orange-red. Overall luminous efficacy for orange and orange-red ones is anywhere from 7 to 28 lumens/watt, with most made after 2000 achieving at least 12 lumens/watt. Yellow ones are mostly a little less efficient, 4 to 15 lumens/watt with most made after 2000 achieving at least 8 lumens/watt. Green ones are less efficient still (mostly 3-4 to about 8 lumens/watt) but more efficient than GaP and GaAlP green LEDs. With the exception of some more-red models, these LEDs have significantly reduced efficiency at low currents of a few mA or less. Typical drive current is 5 to 20 mA. Maximum drive current is usually 30 mA in 3 and 5 mm "bullet" style units. Typical voltage drop at 20 mA is around 1.9 to 2.3 volts depending on the specific variation. "
http://donklipstein.com/ledc.html
350mA :210-250mW !!!!!
