OT what freq of light gives the most visible light - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

Reply
 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 09-10-2002, 02:52 PM Thread Starter
 
Join Date: Dec 1999
Posts: 5,140
Thanks: 0
Thanked 0 Times in 0 Posts
 
OT what freq of light gives the most visible light

IM shopping some LEDs to retrofit some flashlights ( almost backpacking season)

and im wondering what color and what nanometer I should look for to give the best performance, it seems the brightest available are green or red, the white ones are 1/5 or less of the total lumens output of the red/green.

is it ok to use red or green, which would be better?

oh yeah, check out www.eLED.com for your led needs, realy cool site.

ozarkjeep is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 09-10-2002, 03:01 PM
Carpal \'Tunnel
 
knifeboy2's Avatar
 
Join Date: Jul 2002
Location: Macomb, IL
Posts: 2,571
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: OT what freq of light gives the most visible light

Red light has the shortest wavelength, but I belive gives the most visible light. But for camping red light is ideal. It will not ruin your night vision and will be bright enough to see. Any LED will work great for a flashlight though because they are just so darned bright.
knifeboy2 is offline  
post #3 of (permalink) Old 09-10-2002, 03:39 PM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: OT what freq of light gives the most visible light

My youngest daughter recently went to an LDS Church Girls camp for a week. Every year we buy her a flashlight... and she comes home and it's destroyed. She's really rough on equiptment.

So, I decided it was time for a change

I went to Target and bought an $18 <a target="_blank" href=http://www.ebtx.com/mech/optolite.html>Eddie Bauer Opto-E-light</a>. It lasted her the 5 day camp.. She couldn' kill it, and I'd bet it was ALWAYS on... you know at night up her nose, in her ear, showing how red her finger tip was, in her mouth... the kid's inventive. But, I've been using it on the car and for comptuer maintance since she got home on the same set of batteries. I'm impressed.

I have an inepxensive Green LED keyring flashlight... and I've seen blue and red. The colors, though pretty are not my cup of tea. I don't like the diminished light at my age. I want as much "visiable" light as I can get, and I favor white.

As light's nothing more than energy and looking at the photoronic discharge of visible light, violet has the most energy and red the least. White is great for most usage because everything is in color that you're looking at. A white light allows better color distinction but can cause pupil dilation, hence the use of Red for map lights.

IMHO if you wnat a LED flashlght for night Map reading... get a small Red LED for that, and keep a larger White LED flashlight for normal usage. I'm going to buy a couple more of these little $5 wonders and install them in my RollBar mounted overhead light assembly as Map Lights.

LEVE is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 09-10-2002, 03:45 PM Thread Starter
 
Join Date: Dec 1999
Posts: 5,140
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: OT what freq of light gives the most visible light

I converted just now with a "super bright" red LED, and its pretty bright, you can easily see to walk with it, but its red!

I cant find any white LEDs that are rated at a similar output lumens wise, so thats why I was asking.

ive also discovered unless I buy a pretty good sized quantity than im not saving much money on a $0.35 led compared to going to rat shack and buying one ( like I did today) for $2.47

I appreciate the info, Ill have find a physiscs website and try to learn how the color/freq/light thing works more I guess


ozarkjeep is offline  
post #5 of (permalink) Old 09-10-2002, 04:43 PM
Moderator
 
Jim_Lou's Avatar
 
Join Date: Dec 2001
Location: Belleville, Illinois
Posts: 11,504
Thanks: 15
Thanked 22 Times in 17 Posts
         
Re: OT what freq of light gives the most visible light

Think of it this way: Our eyes were designed to work in white light. Anything else is not going to give a true picture of what you're looking at. If you only need to see shapes, any color will do, but I wouldn't want to troubleshoot a wiring problem with a single-color light.
Jim_Lou is offline  
post #6 of (permalink) Old 09-10-2002, 04:49 PM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: OT what freq of light gives the most visible light

Sorry, as ususal I didn't read the post well enough... and missed the part about you retrofitting some flashlights.

I've been looking for about 6 months into retrofitting and finally decided it wasn't worth my time or money at the cost of the White LED's and bit the bullet and bought that Eddie Bauer unit.

Oh yeah, one other thing to consider...as you age your cornea becomes more yellow in color. This does effect how you see light.
LEVE is offline  
post #7 of (permalink) Old 09-10-2002, 04:57 PM
 
Join Date: Sep 1999
Posts: 873
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: OT what freq of light gives the most visible light

"I appreciate the info, Ill have find a physiscs website and try to learn how the color/freq/light thing works more I guess "

I hope I'm not insulting your intelligence by suggesting a really basic site, but try <a target="_blank" href=http://www.howstuffworks.com>www.howstuffworks.com</a>
They have pretty good explanations of just about anything.
Dan 84 CJ-7 is offline  
post #8 of (permalink) Old 09-10-2002, 05:20 PM Thread Starter
 
Join Date: Dec 1999
Posts: 5,140
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: OT what freq of light gives the most visible light

darn Dan,

IM not an Imbecile!

Im kidding! I am a moron!
its ok, Ill check it out!
ozarkjeep is offline  
post #9 of (permalink) Old 09-10-2002, 05:27 PM Thread Starter
 
Join Date: Dec 1999
Posts: 5,140
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: OT what freq of light gives the most visible light

Leve,
here is my price list to date.

$1 flashlight from teh dollar store ( water proof 2 AA, black rubber thing)
$1 for 4 AA batteries from same store

$2.47 super bright red led from rat shack.

and about 5 minutes of soldering ( 4 minutes of which was waiting for cheap iron to heat up)

and ive got a pretty bright red led flashlight.

Ive been checking it in a room with no lights, but as it gets darker Ill check it outside, and then probably leave it on a few days and check its battery life with these ultra cheap batteries.

I also figured the LED is speced at 2.6 V, so im overdriving it slightly, but since the life is usually rated on 100K hours I figure a shortened life is acceptable.

Ill for sure goto target and chekc those lights out though, im always looking for bargains.

ozarkjeep is offline  
post #10 of (permalink) Old 09-10-2002, 09:40 PM
Keyboard Implanted
 
JeepnGreg's Avatar
 
Join Date: Mar 2000
Location: Eureka IL
Posts: 4,676
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: OT what freq of light gives the most visible light

i can never get this right....would we wanna set them up in parallel or in series if we wanted them to be the brightest.....
i have an idea to make a cheap LED dome light for my jeep now
JeepnGreg is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome