Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

User Tag List

Thread Tools Search this Thread
Old 09-11-11, 04:15 AM   #1
Senior Member
Thread Starter
Join Date: Oct 2009
Location: England, currently dividing my time between university in Guildford and home just outside Reading
Bikes: Too many to list here!
Posts: 1,921
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Trying to jury-rig an LED light...

I'm trying to make an LED front light out of two old solar-powered garden lamps, and I need some technical advice. The lamps have 2 AA rechargeable batteries in them, and I've just taken the light and reflector assemblies out of them. I'm thinking I'll just hook them up to two rechargeable AAs and a switch, and I'm planning to run them in parallel. The problem I have is that the lamps have some sort of control circuitry in them (they used to turn on when it got dark, until they got water in them), and I'm not sure I won't put too much current through the LEDs if I run them without the added resistance of the control circuitry. Is this likely to happen? Do I need a resistor in series with the LEDs? Each reflector has 3 white LEDs in, wired in parallel, and there are only two reflectors.

Thanks in advance
Airburst is offline   Reply With Quote
Old 09-11-11, 10:07 AM   #2
seeker333's Avatar
Join Date: Feb 2004
Bikes: yes!
Posts: 3,319
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 87 Post(s)
If those garden lamps are like the ones here in the USA, they are very low output, and not worth the time to mess with. Even a weak flashlight would outshine those things.
seeker333 is offline   Reply With Quote
Old 09-13-11, 08:01 AM   #3
Richard Cranium
Senior Member
Richard Cranium's Avatar
Join Date: Jun 2002
Location: Deep in the Shawnee Forest
Bikes: LeMond - Gunnar
Posts: 2,846
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Not worth the effort, but most of the time specs are on sticker inside or try the net.......

the only thing i could "see" would be a "flasher"
Richard Cranium is offline   Reply With Quote
Old 09-13-11, 06:55 PM   #4
Seņor Member
Join Date: Mar 2011
Bikes: 1987 Bianchi Franken Strada
Posts: 228
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
if they have two rechargable AA's, the solar panel would be useful. It would require some electrical knowhow, but you could probably take out the solar panel and use it as a battery charger. Useful if you are keeping your bike outside during the day or touring. As far as the LED's, too dim to be useful. If you can can do it, buy a bunch of high powered LED's or maybe one or two LED's that are a watt or more-the latter would limit your battery time with just two LED's-and rig up a light array. Otherwise, buy a halfway decent LED flashlight (can be had for cheap if you aren't getting cree's or other high wattage type lights) and use your charged batteries for it.
jrhii is offline   Reply With Quote

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

All times are GMT -6. The time now is 08:00 AM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.