Recent content by bpierce

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  1. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Thanks! I'll check them out.
  2. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    More great info, and points in a a few good directions for more research. Also thanks for the warning about the heat dissipation above -- I am going to press them on that issue, ensure we do a lot of testing, and also get a 2nd opinion since it's so critical. If you don't mind, I may ping you...
  3. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    See my reply below to Fireclaw18. Based on a lot of feedback I've gotten, I'm thinking I'd target an output of roughly 250 lumens and a run time of 45 mins to an hour for an initial release; also I like the idea of using an LiFePO4 battery. That amount of output is probably enough to help people...
  4. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Fantastic feedback -- thanks! Based on what I'd seen from relatively cheap flashlights at big box retailers (ones that also sell lamps), I was also thinking that something in the 250 lumens range may suffice for an initial version of the product. Both you and Steve K have mentioned the...
  5. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Using a common type of battery that can be easily replaced by the consumer is a core requirement, so that will be there. Having the charging system detect a wrong battery ...or alert when the ability to hold a charge diminishes... is a great idea and something I'll investigate. Ditto on the...
  6. bpierce

    PWM - What is it, How does it work and how to detect it.

    Great post. One question: is a circuit that supports higher frequency PWM more expensive to manufacture? Wondering why anybody would go with the lower frequency variety except maybe for cost reasons.
  7. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Wow - the LiFePO4 battery seems like a no-brainer. Thanks! I'll have to work in an emergency light that turns on when the power is cut ...possibly doubling as a night light for those who want it on when dark, power or no power. That feature has just come up too many times. Brian
  8. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    I'd be glad to throw in!
  9. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    I'll be evaluating manufacturers more over the next couple of months, and to be honest I don't know exactly what to expect until I speak with them. I do know that some have their own brands, so may presumably know how to ensure regulatory compliance. Some have in-house design teams, so again...
  10. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Thanks again Steve. I'll definitely checkout those resources. I'm much more likely to keep the price down if I have the relationship with the component suppliers and distributors directly, rather than letting a manufacturer handle that for me. Part of the reason I raised particular concern...
  11. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Thanks for the great thoughts! The battery lifetime is a tough one. Realistically, a user will probably almost forget it's there (as you mentioned) and not replace the battery for years. I am going to do some more research on the points you raise, and also discuss them with my electrical...
  12. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    ...deleting. meant to respond with quotes...
  13. bpierce

    Seeking advice about design/engineering issues when making an LED flashlight

    Thanks for the feedback! You are correct that I am not an expert in all of those areas, nor am I an expert in patent law (another important aspect of this project). I need to rely on the experts I engage -- the engineers and lawyers. But I believe in a "trust but verify" model, whereby I try to...
  14. bpierce

    eBay fraud on some high end lights

    Maybe this is only tangential to the thread (if so, I apologize; I'm a newbie still feeling out whatis appropriate) ...but are sellers on cpfmarketplace policed relatively well? I know caution is always warranted, but wondering if people have dealt with fraud much when transacting on...
  15. bpierce

    Beginner's Guide to explain simple LED flashlight.

    Thanks for posting! I joined this forum to learn more about LED flashlight technology, so introductions like this are great.
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