Poll

7 DIGIT INDICATOR COLOR

RED
GREEN
YELLOW
BLUE
WHITE

Author Topic: What LED digits color You like? <poll inside>  (Read 7365 times)

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Offline james_s

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Re: What LED digits color You like? <poll inside>
« Reply #50 on: September 14, 2018, 04:35:17 pm »
Why are daytime running lights a bad idea? They certainly increase visibility of oncoming cars to me.
 
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Offline thm_w

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Re: What LED digits color You like? <poll inside>
« Reply #51 on: September 14, 2018, 09:59:39 pm »
Why are daytime running lights a bad idea? They certainly increase visibility of oncoming cars to me.

Daytime running lights are clearly a good idea, unless you have some problem with reducing crashes by 5 to 30%.

Quote
Daytime running lights also protect the most vulnerable road users. Studies have found that they reduce certain motorcycle crashes by 23 percent and pedestrian accidents by 12 percent.
However, only 27 percent of the passenger vehicles currently on sale in the United States are fitted with daytime running lights as standard equipment.
:palm:

https://www.ibiblio.org/rdu/DRLs/studies.htm
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2850978/
https://www.carnellfirm.com/blog/2017/09/daytime-running-lights-save-lives-and-reduce-accidents.shtml
 
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Offline bitseeker

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Re: What LED digits color You like? <poll inside>
« Reply #52 on: September 15, 2018, 01:27:43 am »
But on the other hand why are we debating - use these in the device and pick your own color.  :popcorn:

https://www.adafruit.com/product/1399



Sure, as long everyone doesn't start putting them in everything with each segment a different color like that. :o :-DD
TEA is the way.
 

Online xrunner

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Re: What LED digits color You like? <poll inside>
« Reply #53 on: September 15, 2018, 01:45:39 am »
Sure, as long everyone doesn't start putting them in everything with each segment a different color like that. :o :-DD

It might go good like that with that new Rigol DG800. No - I guess it doesn't need more bling.  :-DD
I want to try Prevagen memory support but I can't remember to buy it.
 

Offline TheUnnamedNewbie

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Re: What LED digits color You like? <poll inside>
« Reply #54 on: September 15, 2018, 06:31:40 am »
Isn't there a thing with red light not changing your eyes 'exposure' level? Which is why it is also (used to be?) used for torches for people doing searches at night, it doesn't break your night vision. I guess that might be a reason to go for red?
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Offline bitseeker

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Re: What LED digits color You like? <poll inside>
« Reply #55 on: September 15, 2018, 05:02:09 pm »
Yes, it's that low levels of red light (as opposed to other colors or white) reduce your retina's sensitivity less after it has already adapted to very low ambient light levels.

However, unless your lab is always really dark (that'd make for challenging work on small components), I don't think red LEDs vs. other colors will really matter. For astronomy or late-night stakeouts, it makes more sense.
« Last Edit: September 15, 2018, 05:05:00 pm by bitseeker »
TEA is the way.
 

Offline David Hess

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Re: What LED digits color You like? <poll inside>
« Reply #56 on: September 16, 2018, 02:09:05 am »
I also prefer the 'dot' style LEDs that HP used to use to more conventional seven segment units:

I like the dot style LED displays Tektronix used on their early instruments shown below.
 

Offline rdl

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Re: What LED digits color You like? <poll inside>
« Reply #57 on: September 16, 2018, 10:33:09 am »
I don't like yellow much, so I don't like the older green color LEDS because of the yellowish cast. I usually refer to them as snot green. You can get green LEDs with shorter wavelength that have a more blue look which I do like, but few companies seem to use them. Blue LEDs are fine as long as they are not too bright. My cable modem has LEDs that are green, blue and orange. The blue ones are the dimmest of the bunch and don't bother me at all.
 

Online Fungus

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Re: What LED digits color You like? <poll inside>
« Reply #58 on: September 16, 2018, 12:07:01 pm »
Isn't there a thing with red light not changing your eyes 'exposure' level? Which is why it is also (used to be?) used for torches for people doing searches at night, it doesn't break your night vision. I guess that might be a reason to go for red?

That's true for any primary color. Green and blue work just as well.

It's all down to brightness, IMHO. Add a brightness control and any color will do.

 

Online Kleinstein

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Re: What LED digits color You like? <poll inside>
« Reply #59 on: September 16, 2018, 05:00:27 pm »
Blue LEDs tend to be chosen rather bright. Some people have problems with blue, as it is scattered more and also chromatic aberrations of the eye can confuse focusing a little (not so bad with LEDs, but with blue / black contrast on the computer screen).  I usually prefer red, as the colored cover is usually best and helps with contrast.
 

Offline GeorgeOfTheJungle

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Re: What LED digits color You like? <poll inside>
« Reply #60 on: September 16, 2018, 05:07:22 pm »


 :-+
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Offline bson

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Re: What LED digits color You like? <poll inside>
« Reply #61 on: September 17, 2018, 07:11:21 am »
Why are daytime running lights a bad idea? They certainly increase visibility of oncoming cars to me.
It also makes it obvious if a parked car has its engine running - if not, it's not a candidate to suddenly pull out in front of you.  Even if the driver turns the wheels.  Or, if the lights just went off it's because the engine was turned off, so expect a door to fly open and someone to step out into the street.  Basically, you can drive past entire blocks of parked cars, and any potential hazards advertise themselves with their headlights.
 
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Offline TheBay

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Re: What LED digits color You like? <poll inside>
« Reply #62 on: September 17, 2018, 10:00:55 am »
Red or Amber for me, why is there no Amber option on this poll?
One thing I've always liked about the BMW's I've owned, they have always had Amber illumination.

Blue LED's are awful, they only belong in a RGB array.
 

Offline 001

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Re: What LED digits color You like? <poll inside>
« Reply #63 on: September 17, 2018, 01:24:28 pm »
why is there no Amber option on this poll?

See my previous post:

I write 'yelow' in the pool since it is the basicaly same orange/amber LEDs but in high bright mode
Looks attractive but why industrial meters didn`t use them? Is it for some ergonomix problems?


Theme became hot  :popcorn:
 
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Offline TheBay

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Re: What LED digits color You like? <poll inside>
« Reply #64 on: September 17, 2018, 01:25:44 pm »
why is there no Amber option on this poll?

See my previous post:

I write 'yelow' in the pool since it is the basicaly same orange/amber LEDs but in high bright mode
Looks attractive but why industrial meters didn`t use them? Is it for some ergonomix problems?


Theme became hot  :popcorn:

But you can get Orange, Yellow and Amber LED's, not being pedantic but they are all different.
 

Online Cerebus

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Re: What LED digits color You like? <poll inside>
« Reply #65 on: September 17, 2018, 02:26:35 pm »
Isn't there a thing with red light not changing your eyes 'exposure' level? Which is why it is also (used to be?) used for torches for people doing searches at night, it doesn't break your night vision. I guess that might be a reason to go for red?

That's true for any primary color. Green and blue work just as well.

It's all down to brightness, IMHO. Add a brightness control and any color will do.

Er no, blue and green don't work as well. It's down to the fact that you have two vision systems rods (scotopic) and cones (photopic). The scotopic system works in low light conditions (think moonlit mcd/m2 or starlit µcd/m2) and only gives you monochrome vision, the photopic system works in brighter light and gives you colour vision. If you look at the spectral sensitivity curves for the two systems you'll see that scotopic vision (V'(λ) in the graph) is almost completely insensitive to red.



The pigments in the visual system that respond to light suffer from bleaching, depletion in bright conditions where it takes time for the pigment to be regenerated. You can see this for yourself by looking at a bright object, close your eyes and you'll see an image persist on your retina for as much as several seconds. In daylight conditions the scotopic pigments are in a semi-permanent 'bleached out' condition which is why it takes time for your vision system to adapt to low light.

The scotopic system fails to absorb at long wavelengths so does not suffer the bleaching effect if it is only exposed to red light and thus red doesn't ruin your dark adaption. Expose yourself to bright monochromatic green or blue light and you will destroy your scotopic dark adaption. Following the response curve for the scotopic pigments, the shorter the wavelength (up to around a 480 nm peak) the more effect it will have on your night adapted vision.

If you're in low light, but bright enough to still be photopic conditions then monochromatic blue, green or red light would all be partially protective of low light colour vision as long as they were used singly as there are three photo-pigments involved in the photopic regime.

In daylight conditions the scotopic pigments will still respond to really bright stimuli, which is why some bright blue lights (LEDs) near the sensitivity peak for scotopic vision are irritating as they are partially activating your night vision system while you're actively using your daylight vision system.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline Nisei

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Re: What LED digits color You like? <poll inside>
« Reply #66 on: September 17, 2018, 04:09:09 pm »
Back in the days when nearly the only color being used was red (particularly alarm clocks) it was cool to see other colors become available.
However, I've been using other colors now and then but I still prefer red nowadays.
I always use 2 layers of Lee 027 medium red filter in front of the display. It looks nearly black when turned off and it perfectly lets the red wavelength pass so it gives great contrast without reducing brightness.
 

Offline TheBay

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Re: What LED digits color You like? <poll inside>
« Reply #67 on: September 17, 2018, 04:42:11 pm »
Red was always best for the bedroom as you can't see it when your eyes are closed, I stayed in a hotel with a Blue LED alarm clock. No idea who thought that was a good idea!


Back in the days when nearly the only color being used was red (particularly alarm clocks) it was cool to see other colors become available.
However, I've been using other colors now and then but I still prefer red nowadays.
I always use 2 layers of Lee 027 medium red filter in front of the display. It looks nearly black when turned off and it perfectly lets the red wavelength pass so it gives great contrast without reducing brightness.


Also colour differences, I took a picture of this earlier on my car.
Orange led compared to Amber led, the colour balance of my camera has skewed it somewhat but in real life the petrol symbol is Orange and the mileage etc is deep Amber.
« Last Edit: September 17, 2018, 04:45:31 pm by TheBay »
 
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Offline 001

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Re: What LED digits color You like? <poll inside>
« Reply #68 on: November 28, 2018, 09:15:45 pm »
September tread is not necroposting isnt it?  :-DD
It was very interesting to know yours favorite indicator color  :-+
AND WHAT ABOUT HEIGHT?
 

Offline Gyro

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Re: What LED digits color You like? <poll inside>
« Reply #69 on: November 28, 2018, 10:09:17 pm »
The killing Flukes thread AND this? :palm:
« Last Edit: November 28, 2018, 10:12:04 pm by Gyro »
Chris

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Offline 001

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Re: What LED digits color You like? <poll inside>
« Reply #70 on: November 28, 2018, 10:14:17 pm »
The killing Flukes thread AND this? :palm:
what do You mean?  :-//
 

Offline Gyro

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Re: What LED digits color You like? <poll inside>
« Reply #71 on: November 28, 2018, 10:17:58 pm »
I mean it's an utterly pointless question - High enough to be comfortably readable at whatever distance you're reading it - Obviously!

You wan't to know about blowing up Flukes without being bothered to watch the video you were pointed to, now this - it's rather too much from one person in the space of an hour!
« Last Edit: November 28, 2018, 10:22:00 pm by Gyro »
Chris

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Offline 001

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Re: What LED digits color You like? <poll inside>
« Reply #72 on: November 28, 2018, 10:22:06 pm »
I mean it's an utterly pointless question - High enough to be comfortably readable at whatever distance you're reading it - Obviously!

One my friend put 2" ticker on the bench  :-DD 
It is not cool for my eyes
 

Offline cdev

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Re: What LED digits color You like? <poll inside>
« Reply #73 on: November 28, 2018, 10:40:07 pm »
A couple of years ago I went looking for info on why my eyes hurt badly when forced to look at ultrabright blue LEDs, and I found a lot of stuff.

https://www.ncbi.nlm.nih.gov/pubmed/?term=%22blue+led%22  (only the deepest blue LEDs have this problem, whitish blues like the ones in VFDs dont!)

Mixed in there I also found some interesting info on other colors. Green LEDs have no problems at all, it seems and green is also the most visible color so you can use dimmer LEDs and maintain sharpness and legibility. I dont like super bright green that much, I always turn it down, but even super bright green does not hurt my eyes like blue does. Also green LEDs seem to last the longest of the non-red colors.

I also like red. Orange is okay too.
"What the large print giveth, the small print taketh away."
 
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Offline stj

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Re: What LED digits color You like? <poll inside>
« Reply #74 on: November 29, 2018, 02:43:00 am »
maybe the chinese will make 7segment displays with near-UV leds.
then we can put "interesting" phosphor doped filters in front of them.  8)
 


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