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Thread: What would you use?

  1. #1

    Default What would you use?

    Hello everyone. I am obviously new to the forums, but I love what I am reading! What a wealth of knowledge and support!

    Quick question on another (final) school project I am trying to figure out...let's say you wanted to build the brightest headlamp possible, in an inexpensive way, utilizing LED's as the light source (with a reflector). I would want my battery(s) to be able to sustain the LED's for 3-hours before I needed a recharge (if using gel cell). Or, if using standard over-the counter (throw away) batteries, I would still like the same 3-hour charge.

    Which direction would you tend to go? LED choice, battery choice? BTW, I wasn't sure which section to post this question in, so if it needs to be somewhere else, my apologies. I look forward to your responses! Any answers would be a great help, since I need to start my construction ASAP.

    Sincerely,

    Gary Robertson

  2. #2
    *Retired* The_LED_Museum's Avatar
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    Default Re: What would you use?

    In my opinion, this belongs in the Homemade and Modified Lights forum, so that's where I'm going to move it. [img]/ubbthreads/images/graemlins/smile.gif[/img]

  3. #3
    Flashaholic*
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    Default Re: What would you use?

    White light or will some other color (green, orange) do? How will brightness be measured, by meter or by eyeball?

  4. #4
    Enlightened
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    Default Re: What would you use?

    brightness will be measured by meter.
    As you want to build a headlamp...well how many led you use? using 1 AA 1400 mAh you can make the LED work for at less 4hrs.<--1 W LED

  5. #5

    Default Re: What would you use?

    White light is preferred, and no real measuring scale will be used other than by eyeball. I need the brightest light possible, on a limited budget. In other words, how can I best light up an area about 6-8 feet in front of me, with a swath of light maybe 6-8' wide? For the least amount of money. Knowing a VERY limited amount about LED's, I was thinking about perhaps an LED cluster which bounces off of a chrome reflector, similar to a fog light on a vehicle, for lack of a better example.

    ANY IDEAS are encouraged, and I can't thank you all enough for trying to help me out. This is one great forum! I look forward to your help!

    Thanks-a-million.

    Gary Robertson

  6. #6

    Default Re: What would you use?

    Sounds like you want a floodlight type output. I would suggest something like 12 5mm white LEDs or more.

    I made a 12 LED headlamp by modding a cheap $4 headlamp with a boost circuit and 12 26kmcd LEDs. It is pretty bright for about 3 hours. I modded the original reflector to catch some sidespill but LED sidespill doesn't amount to a whole lot. If you use 5mm LEDs I wouldn't bother with a reverse bouncing reflector and engineering one properly for a luxeon will be time consuming and possibly costly and require extra space and weight in a headlamp.

    12 LED headlamp mod

  7. #7

    Default Re: What would you use?

    Thanks for the info, Lynx! Great stuff, indeed! Does anyone else have a recommendation to add? Anyone?

    Thanks!

    Gary

  8. #8
    Enlightened
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    Default Re: What would you use?

    USE China LED you will be able to make it super CHEAP!!!In USA you wont get that cheap :P

    find one that with small angel veiw to make better pattern
    another choice is to use Nichia's LED <-- one of the best LED
    [ QUOTE ]


    The 26kmcd LEDs don't make a beautiful pattern but it is still rather bright and very useful and appears to be a good battery drainer.



    [/ QUOTE ]

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