Recent content by sharpstick

Gather App
Candle Power Forums

Help Support Candle Power:

  1. S

    power supply for LEDs

    To design solar power(or optionally batteries that may have variable voltage around 11 - 14 volts) white LED system, I would think that the best solution would be a bank of LEDs in parallel powered by a drop-down converter set to output a voltage within the forward voltage of the LEDs, 3.2 - 3.8...
  2. S

    wonky interface on Ultrafires

    I have a T6 Ultrafire I got over a year ago. It works fine. It has the push-pull zoom. It goes on and off. I had totally forgotten that it had different mode. I just got a couple newer ones. Every time I turn them on, they randomly dump me into a random mode. I really don't appreciate turning...
  3. S

    step-up for multiple LEDs

    I want to drive several (somewhere between 2 and 10, pending testing) 20ma UV LEDs, typ 3.6V. For testing, I'm using an LM317T to run them, but I want to run them off of a small battery pack(two or four AAs would be nice). Is there a fairly simple step up current regulator circuit that will...
  4. S

    Where to buy led's these days?

    I ordered some LEDs from lck-LED last month. According to their shipping notice, the order should have arrived over a week ago. I emailed several times to check on the order and have not gotten any response. I started a claim at Paypal and am still waiting for some response from them. If they...
  5. S

    UV LEDs

    I am making a black light art project. Basically it's several UV LEDs mounted in a row, shining upward onto day glo art. I plan to start with about five to ten 20ma LEDs. I am considering using UVA LEDs. Gloinc recommends 365nm as the best color. I have seen warnings "Again I must...
  6. S

    best home lighting solution

    DOH! yes, I mean efficient. (fixed it). So, I am still looking for recommendations on inexpensive driver designs. Either premade or simple to make. I can solder 2 or 3 parts together and pot them, but have no desire to make big PCB drivers. I had thought that if the supply voltage is not to...
  7. S

    best home lighting solution

    I am planning to eventually convert our house to a 12 volt solar power system. I plan to start with making undercounter lighting for the kitchen with AC to DC wall warts. Straight 12 VDC, simple. I should be able to figure out the right dropping resistors for each LED or bank of them. I also...
  8. S

    Photon ReX? Also check out the new proton!

    I have a Rex. I've had problems charging it, though. it seems to be working now. I would also like to see a USB charger. according to at least one vendor, the Rex can be charged with any battery up to 6 volts. Does anyone know if this is true? If so, it would be pretty easy to cut up a USB...
  9. S

    Best choices for 123 lights as bike lights

    for cheap lights, sams club has a two-pack of Element brand 3 watt luxeons for $28. oops, they just upgraded the set to 4 watts: http://www.samsclub.com/shopping/navigate.do?dest=5&item=381032 i've got about 6 of the original 1 watt and 2 of the 3 watt ones. i use them for casual use around...
  10. S

    T3 + Clamp = Front Light?

    can you justify a 270 lumen Q5 light with charger and batteries for $40? http://scopeandlaser.com/index.php?sp=&p=6&cat2=0&cat1=161&cat0=45&id=1551&cat1=161&cat0=45&new=&more=〈=en i have mine in a fenix swivel clamp on the front fork. or 370 lumens for $48...
  11. S

    Rugged DIY dynamo LED light

    Why are all bike headlights mounted high on the handlebars, pointing DOWN at a spot a few feet away? I've got mine mounted on each side of the fork aiming sligthly downward so they light up a long oval ahead. The only consideration is that that doesn't provide as much light to announce your...
  12. S

    Anybody tried this FL mount?

    i have this one: http://www.candlepowerforums.com/vb/showthread.php?t=100849&highlight=luxeon+bike) & Electrolumens Quadstar Bikelight made by fenix. the angle is adjustable in 15 degree firm click increments, it looks a bit flimsy, but has held up well for several months. i also have a safety...
  13. S

    Anyone used the LT1932?

    It looks like a promising chip for what I want, but is there a non SMD version? I don't think I'm capable of soldering SMDs. What I want is a driver that can run 6 to 10 20ma LEDs from a low voltage sourse, 1 to 3 VDC.
  14. S

    RGB = W - sort of

    Considering that white LEDs are not very efficient at converting to white light, I am thinking of using separate R G and B LEDs to make a more efficient light source. I understand that it will have a somewhat spiky spectrum, but I've put RG & B together before and they make a reasonably good...
See more

Latest posts

Back
Top