Are you interested in LED light? - Page 10 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th November 2012, 03:01 PM   #91
jitter is offline jitter  Netherlands
diyAudio Member
 
jitter's Avatar
 
Join Date: Aug 2004
Location: Eindhoven, The Netherlands
Quote:
Originally Posted by wwenze View Post
Does that lamp happen to be marketed as 'dimmable' via standard AC light dimmers?
Most dimmers made for incandescents need a minimum load (e.g. 60-300 W). If you go below the minimum load, chances are the light may flicker. Dimmers made specifically for LEDs have no or a very low minimum load.
  Reply With Quote
Old 11th November 2012, 03:19 PM   #92
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Quote:
Originally Posted by AndrewT View Post
That's not the way our eyes work.
It's the way that my eyes work, but that's because I am colour blind. There are swept tests, one of which you can find on youtube, of a dancing mosaic. A small square moves about the field of grey stones and sweeps from one end of the spectrum to the other, with normal vision you see the square slowly sweep through the visible spectrum.. With myself however the colourful square disappears twice, once at each interval where the receptors are supposed to overlap, but in me there's a small gap instead.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 12th November 2012, 11:31 AM   #93
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Just like our hearing, it varies person to person. If anyone can find the test 5th mentions, it would be a fun test. Of course, you have to realize you are looking at it through a PC, whose display in also a set of overlapping bands based on the filters selected in the LCD. Trying to think how one could actually do a test like this. A hot-wire ( or sun) and a prism maybe?
  Reply With Quote
Old 12th November 2012, 11:39 AM   #94
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
I learned from making photographic prints (the wet chemistry way) that I had a different color balance in each eye.
  Reply With Quote
Old 12th November 2012, 12:55 PM   #95
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Quote:
Originally Posted by tvrgeek View Post
Just like our hearing, it varies person to person. If anyone can find the test 5th mentions, it would be a fun test. Of course, you have to realize you are looking at it through a PC, whose display in also a set of overlapping bands based on the filters selected in the LCD. Trying to think how one could actually do a test like this. A hot-wire ( or sun) and a prism maybe?
The narrow band are relatively small, so I doubt a prism would really show this well. You might be able to see tiny colourless spots if you're colour blind, but I never have (not that I've ever been looking).

The computer might be an issue with the test, but from my experience it hasn't been. The first time I saw the test was when studying biology at A level. My biology teacher knew I was colour blind and not for my class but for another, she had told their teacher that I was, so when my class was in session and theirs was too along came the other teacher and requested my presence in their class because they were studying the eye and had this test set up. None of the other class had any student in it who was colour blind and they hadn't had the test explained to them before and indeed I hadn't been told what to expect either, but I guessed what was supposed to happen as soon as the test started. I was told to say what I see and when it got to the spot where the square vanished there were gasps of amazement when I said 'it's vanished'

This was on an old CRT monitor iirc and later on, on a DELL U2311H I performed the test again with my parents and they both saw the continuous colour changing square, where for me, it disappeared twice. I then performed the test again with my brother, he is also colour blind and I wanted to see if he saw things in the same way I did, or whether there were differences. There were however differences. We both saw the square vanish twice, but the size of the gaps between the different receptors was different for both of us, both in terms of size of gap and when the gaps started.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 12th November 2012, 03:55 PM   #96
jitter is offline jitter  Netherlands
diyAudio Member
 
jitter's Avatar
 
Join Date: Aug 2004
Location: Eindhoven, The Netherlands
Quote:
Originally Posted by tvrgeek View Post
If anyone can find the test 5th mentions, it would be a fun test.
I think it's this one.

I'm know not colour blind, I passed an Ishihara test when I was seventeen when I was tested for military service (conscription). But in the video the colours do seem to vary in intensity, esp. when blue turns to purple they're only just present. Is this supposed to happen or is it the computer monitor?

Last edited by jitter; 12th November 2012 at 04:15 PM.
  Reply With Quote
Old 12th November 2012, 05:01 PM   #97
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Yes, that's the one. It doesn't work perfectly on the tablet as it tries to do some fancy dynamic compensation, but the square disappeared once between red/blue and almost vanished between yellow/red.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 12th November 2012, 09:46 PM   #98
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Cool. I just watched it with an old Toshiba laptop and it looked pretty uniform through all the colors, maybe just a tad light in the tan. I was waiting for an intense yellow or mustard but I never say one.

What does that say? Nothing much as the latop is an unknown. It probably says I don't have a significant problem. As least something in these old bones still works. I would bet almost everyone in this forum would get slightly different results and we would not know if it was eyes or monitor.

When I was suggesting a prism, I was thinking of a slot to get very narrow bands and not be constrained by laser frequencies.
  Reply With Quote
Old 12th November 2012, 10:38 PM   #99
wwenze is offline wwenze  Singapore
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by 5th element View Post
Yes, that's the one. It doesn't work perfectly on the tablet as it tries to do some fancy dynamic compensation, but the square disappeared once between red/blue and almost vanished between yellow/red.
Yea... I was just wondering if that test would fail if the screen uses RGB OLEDs.
  Reply With Quote
Old 12th November 2012, 11:33 PM   #100
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
It's an interesting test, never seen it before. I'm going to try in on several different projectors and monitors to see if it makes a difference.
FWIW, LCD displays are notoriously bad on color. They tend to have reds that skew toward orange.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
LED power on light? newtube Tubelab 2 6th March 2010 11:48 PM
turned on Aleph 1.2,but LED doesn't Light up Steve Fay Pass Labs 13 27th November 2004 10:37 AM


New To Site? Need Help?

All times are GMT. The time now is 06:12 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2