Which color LED is most brightness?

[Boki]

Hi All,

Which color of LED is most brightness ?

In my test, red is brighter than blue.

Best regards,
Boki.

 

[David L. Jones]

Hi All,

Which color of LED is most brightness ?

In my test, red is brighter than blue.

Not if you are underwater :->

1 lumen is 1 lumen, regardless of the colour. It all depends on what
sensor you are using (human eye or a sensor), and what medium the light
pases through.

Dave

 

[Joerg]

Hello Boki,

Which color of LED is most brightness ?

In my test, red is brighter than blue.

How did you do that test?

Many people's eyes perceive "super red" as the most bright for a given
current. But that can be different, depending on your age (no, you don't
have to tell us...), degree of color blindness, contaminants such as
water vapor (fog) in the path and so on.

 

[Rich Grise]

Hello Boki,


How did you do that test?

Many people's eyes perceive "super red" as the most bright for a given
current. But that can be different, depending on your age (no, you don't
have to tell us...), degree of color blindness, contaminants such as
water vapor (fog) in the path and so on.

Well, how bright is bright? It might be interesting to set up a little
jig, with a red and a green (and maybe others) LED, where each one has
a pot, with a knob. You tell your victims^H^H^H^H^H^H^Htest subjects to
adjust them until they're "equally bright", then take a photometer of
some kind, and your trusty DVM, and log what the currents and PHM
readings are.

Write that up properly, and you could probably get federal funding. ;-)

Cheers!
Rich

 

[Joerg]

Hello Rich,

Well, how bright is bright? It might be interesting to set up a little
jig, with a red and a green (and maybe others) LED, where each one has
a pot, with a knob. You tell your victims^H^H^H^H^H^H^Htest subjects to
adjust them until they're "equally bright", then take a photometer of
some kind, and your trusty DVM, and log what the currents and PHM
readings are.

Supposedly that is the method used in Germany to set the chroma balance
when they introduced color TV. At first a dozen candidates or so and
when they found that the spread was rather huge they upped that number
big time IIRC.

Write that up properly, and you could probably get federal funding. ;-)

Nah, you'd have to be well connected or know people who are and
preferably be in the agriculture business.

 

[Boki]

David L. Jones 寫�：

Not if you are underwater :->

1 lumen is 1 lumen, regardless of the colour. It all depends on what
sensor you are using (human eye or a sensor), and what medium the light
pases through.

Dave

Of course, my device works on normal condition - between your air and
my air ~
In fact, no datasheet, I not sure the LED / due color / tri-color ...
will get same lumen ?


Boki.

 

[Boki]

Joerg 寫�：

Hello Boki,




How did you do that test?

Many people's eyes perceive "super red" as the most bright for a given
current. But that can be different, depending on your age (no, you don't
have to tell us...), degree of color blindness, contaminants such as
water vapor (fog) in the path and so on.

Um... in fact, test by ................. my eyes, not for verfication.

Many years ago( about 1996 ), I remember that a classmates told me that
blue LED was investaged by a Japanese, is that true ?

Boki.

 

[Joerg]

Hello Boki,

Um... in fact, test by ................. my eyes, not for verfication.

Hah! That ain't going to work...

Many years ago( about 1996 ), I remember that a classmates told me that
blue LED was investaged by a Japanese, is that true ?

IIRC it was Shuji Nakamara at Nichia Chemical.

I almost got fooled into believing it had been invented much earlier. A
friend asked me to drive his car (VW Golf?) back to his house since I
was living just across the street. This car had LED indicators for
everything. It was late and a dark road so when I switched on high
beams, surprise, a blue one came on. Later I was told that this "LED"
was actually a light bulb that was made to look like a LED.

 

[RHRRC]

Hello Rich,


Supposedly that is the method used in Germany to set the chroma balance
when they introduced color TV. At first a dozen candidates or so and
when they found that the spread was rather huge they upped that number
big time IIRC.



Nah, you'd have to be well connected or know people who are and
preferably be in the agriculture business.

Also, since this work was successfully undertaken some 80 years ago -
the results of which have been subsequently indirectly verified by many
of thousands of researchers and has had universal worldwide acceptance
as 'the CIE colour matching chart' for over 70 years - obtaining
federal funding will be certain.

 

[Scotty]

Hi All,

Which color of LED is most brightness ?

In my test, red is brighter than blue.

Best regards,
Boki.

When I searched for green laser pointers, I saw somewhere that the
human eye is most sensitive to green. So maybe an equivalently rated
red and green LED will show the green to appear brighter?

Of course, silicon (etc.) sensors will have different sensitivities.

--Scott