LED bulbs


  #1  
Old 12-17-14, 04:59 AM
the_tow_guy's Avatar
Group Moderator
Thread Starter
Join Date: Feb 2001
Location: SW Fla USA
Posts: 12,305
Received 266 Upvotes on 217 Posts
LED bulbs

This might be a dumb question, but can a LED bulb get "weak"? I've got a nice little LED flashlight that runs on 4-AA batteries. Problem is the bulb brightness is practically non-existent. If I stick my face right up to it, I can see the light come on and off when I cycle the switch, but it's useless for any lighting. Already swapped batteries and cleaned any accessible contacts with no improvement.
 
  #2  
Old 12-17-14, 05:19 AM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 19,281
Received 8 Upvotes on 8 Posts
Did it ever work correctly? I have some cheapo brand new ones that will barely light the sidewalk when I'm walking.

I'm not positive, but I don't think it's the LEDs so much as the electronics. LEDs pretty much work or they don't in my experience. Could be wrong...
 
  #3  
Old 12-17-14, 04:06 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,607
Upvotes: 0
Received 11 Upvotes on 10 Posts
I use a AAAA pencil type led light, and occasionally the cap end will get a little funky and will lose copper to copper contact. I have to take it apart, clean it with an abrasive to shine up the copper. Otherwise it will be very dim.
Name:  flashlight.jpg
Views: 92
Size:  4.4 KB
 
  #4  
Old 12-17-14, 06:30 PM
F
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
Received 39 Upvotes on 31 Posts
LEDs DO deteriorate but it is a long time. The time frame for LED longevity is usually measured as the time for the light output to drop to 70% of the original output.

One problem I have found is that because of the very low current drain LED flashlights are very susceptible to the slightest bit of corrosion on the battery contacts, the current is so low it can't "burn through" the corrosion. I have to periodically remove the battery and clean the contacts, usually by just rubbing them with a coarse bit of fabric is all that is needed, or sometimes by just "rolling" the battery in the holder. For heavy duty cleaning you might try a new pencil eraser but be sure to follow that with a dry cloth to remove any rubber particles.

The cheaper the flashlight the more often I have to do this. The cylindrical free ones at Harbor Freight that take three AAA cells are notorious for this.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: