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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   LED (Flashlight) Durability (https://talk.maemo.org/showthread.php?t=68482)

ndi 2011-01-17 16:56
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by Mentalist Traceur (Post 922399)
TDoesn't mean all of them have to turn sexual. That time it was a regular shower.
We didn't mean for you :D

stickymick 2011-01-17 17:11
Re: LED (Flashlight) Durability
 
As Petur says.The LEDs wouldn't give enough light for photography, so they are "overpowered" so to speak. More than enough power is supplied in an effort to get them flood the scene enough. But because this power is only a very short burst (milliseconds) if that, there isn't enough heat generated to burn them out. Supply that amount of power constantly over a prolonged lengh of time and it could potentially damage the LCD filaments.

Just something that I learned during an electronics course.

Aonsaithya 2011-01-17 17:55
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by dr_frost_dk (Post 922274)
just wanted to add here

one night where i was very sleepy, i forgot to turn off the flashlight (cam LEDs) and it burned for 5hours+.

it still works fine since it has been stated before that when you use flashlight function the LEDs are only driven at a low % of there full potential.

and i have also been making LED lights for home & flashlights for 6+ years, so i know what they can take.
Similar story here. During pre-sleep EightyOne-sessions in dark, 1/5 is still too bright so I keep the leds on, illuminating the background to compensate for the overly-bright backlight (I'm somewhat sensitive, I have most of my devices on minimum brightness all the time and it's usually still too much, but at least I enjoy improved battery life...).
Once I fell asleep with the leds still on, and woke up about 10 hours later. I was slightly worried about durability of the leds then, but seeing how it happened months of daily usage ago I have learned to "stop worrying and love the phone".

butler 2011-01-20 00:48
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by Aonsaithya (Post 922439)
Similar story here. During pre-sleep EightyOne-sessions in dark, 1/5 is still too bright so I keep the leds on, illuminating the background to compensate for the overly-bright backlight (I'm somewhat sensitive, I have most of my devices on minimum brightness all the time and it's usually still too much, but at least I enjoy improved battery life...).
Once I fell asleep with the leds still on, and woke up about 10 hours later. I was slightly worried about durability of the leds then, but seeing how it happened months of daily usage ago I have learned to "stop worrying and love the phone".
You can reduce screen brightness further. Try in terminal:
Code:
root
echo >/sys/class/backlight/acx565akm/brightness 3
Number in the command should be in range 1..255. Change is temporary -- it lasts till next brightness autoadjust or screen on/off cycle.

9000 2011-01-20 00:55
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by butler (Post 924290)
You can reduce screen brightness further. Try in terminal:
Code:
root
echo >/sys/class/backlight/acx565akm/brightness 3
Number in the command should be in range 1..255. Change is temporary -- it lasts till next brightness autoadjust or screen on/off cycle.
I am sure you mean:

Code:
root
echo 3 > /sys/class/backlight/acx565akm/brightness
;)

dr_frost_dk 2011-01-20 10:01
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by Aonsaithya (Post 922439)
Similar story here. During pre-sleep EightyOne-sessions in dark, 1/5 is still too bright so I keep the leds on, illuminating the background to compensate for the overly-bright backlight (I'm somewhat sensitive, I have most of my devices on minimum brightness all the time and it's usually still too much, but at least I enjoy improved battery life...).
Once I fell asleep with the leds still on, and woke up about 10 hours later. I was slightly worried about durability of the leds then, but seeing how it happened months of daily usage ago I have learned to "stop worrying and love the phone".
We are talking about the FLASH Leds at the camera right???

and side note on your screen brightness, check out my Custom Brightness for N900 - no ALS is now ready for install this will give you the brightness settings you want and disable that stupid slow reacting light sensor

eiffel 2011-01-20 10:35
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by petur (Post 922227)
Sorry, no time to go look the n900 specs up myself ;)
Just read the fine source code for the flashlight app.

retsaw 2011-01-20 10:39
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by butler (Post 924290)
You can reduce screen brightness further. Try in terminal:
Code:
root
echo >/sys/class/backlight/acx565akm/brightness 3
Number in the command should be in range 1..255. Change is temporary -- it lasts till next brightness autoadjust or screen on/off cycle.
The range is 0..255, but 0 turns the backlight off, though with the N900s transreflective screen it is quite usable in bright sunlight with the backlight off.

dr_frost_dk 2011-01-20 10:55
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by retsaw (Post 924466)
The range is 0..255, but 0 turns the backlight off, though with the N900s transreflective screen it is quite usable in bright sunlight with the backlight off.
since PR 1.3 i had to change my custom brigthness to only go to brightness 2, because now after PR 1.3 Value 0 and 1 turns to screen brightness/leds off

ndi 2011-01-20 12:26
Re: LED (Flashlight) Durability
 
Quote:
Originally Posted by stickymick (Post 922407)
As Petur says.The LEDs wouldn't give enough light for photography, so they are "overpowered" so to speak. More than enough power is supplied in an effort to get them flood the scene enough. But because this power is only a very short burst (milliseconds) if that, there isn't enough heat generated to burn them out. Supply that amount of power constantly over a prolonged lengh of time and it could potentially damage the LCD filaments.

Just something that I learned during an electronics course.
That is theoretically correct, but it's not how it works. A phone flash has 2 modes, flash and light. One lights up to 60 percent, continuous and the other to 120 percent for 0.4 seconds.

When shooting video in the dark, the LED stays on, with no ill effects. The power is way under what is pumped through on flash.

The flashlight app uses the continuous underpower mode, otherwise it'd be dead within minutes.


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