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Thread: Dorcy Super 3 Watt LED Lantern

  1. #1
    Flashaholic* monkeyboy's Avatar
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    Default Dorcy Super 3 Watt LED Lantern

    Check out the latest flashlight review:

    http://www.flashlightreviews.com/rev..._3wlantern.htm

    As far as I know, this is the first 4D lantern style light that uses a high power LED. That large reflector produces incredible throw. It's a shame that this paricular model has such a puny overall output. I would like to see this lantern with either a Luxeon k2 or an Osram Ostar driven close to the limit. The head could be made of metal and there's plenty of space for a large heatsink.

    It should be regulated too.
    Last edited by monkeyboy; 06-19-2006 at 07:54 AM.

  2. #2
    Flashaholic* Ty_Bower's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by monkeyboy
    The head could be made of metal and there's plenty of space for a large heatsink.
    It could be, but if I recall correctly, in stock form this Dorcy has a head made almost entirely of plastic. There's almost no thermal path for the Luxeon. The poor thing is surely doomed to cook itself to death.

    I guess the typical owner should get at least a couple hundred hours of life out of the thing, if not a thousand. That's still better than most incandescent lamps. By then, LEDs will be even brighter and more efficient. You can throw it out and buy a better one.

  3. #3
    Flashaholic* monkeyboy's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    For a Luxeon 3, I think an internal heatsink would do the job like in the SL 4AA luxeon. The head is so big that a large heatsink could dissipate enough energy into the plastic. The existing luxeon 3 could then be driven 3 times brighter which would make it out throw just about anything.

    I think this lantern would be good for modding.

  4. #4
    Flashaholic zapper's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    I modified and sold a few like this over a year ago now and still no problem. I took a regular $3 lantern and modified the reflector a bit for proper focus. I used a 1/4" thick slug of aluminum about the diameter of the reflector as the heat sink and a resistor to bring the voltage down to about 4 volts. No problems and throws a baseball beam about forever.
    Veni Vidi Vici ( I came, I saw, I conquered)
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  5. #5
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Since it will run on 4 'D' batteries, I wonder how the runtime would be using NiMh AA cells inside 'D' adapters?
    Fenix L1P, L2D CE, L0P SE, Zebralight Q5 CREE headlamp, Huntlight ft02x, Tikka XP, PT Aurora & Eclipse 2, SL ProPoly 4aa Lux and Twintask 1L, Inova X1, Dorcy 1aaa, MagLED 2AA, Nuwai HLX-712L, Akoray K-106 AA, Rayovac 1AA headlamp.

  6. #6
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Got one of these at a Sear's hardware on sale for $30 a while back. Doug's not kidding about beam being ringy. I pulled the head apart and sputtered the reflector, and now it is much better. Still has just one darkish ring outside the hotspot, but no big deal off the white wall, and still seems to have almost all of the throw the smooth reflector had. I am surprised at the "low output" remarks, as mine seems a real killer. Blows away my small 3W lights. The closest thing I have to it is my Dorcy 3-D 1W, but that is a real small hotspot, this thing throws a bigger spot out there, so I would have guessed it makes more overall light. Looks like my eyeball assesment is contrary to the numbers on the reviews.

  7. #7
    Flashaholic* monkeyboy's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    I guess it's possible that the manufacturer made different batches using different resistor values for the voltage regulation. Perhaps the first batches were brighter but people complained about LED's burning out so they increased the resistor value.

    Hondo, does this use a visible resistor that can be easily replaced by a lower value one or a more sophisticated voltage regulator?

    How easy do you think it would be to add a heatsink?

  8. #8
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    As I recall, it is just a direct drive through a resistor. Not sure about packaging a heat sink, I would have to open it up and have another look. If I do I will try to read the resistor value. My subjective impression may be influenced largely by the effects of a nice, big reflector at work.

  9. #9
    *Flashaholic* Illum's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Its odd, whoever the engineer is obviously never used a luxIII.

    If its driven at full power it will , but this is driven at a Lux I supposely for greater efficiency.

    Doug ran this for 42 hours, im surprised it didnt , I tested my XO for 2 hours and the aluminum was very warm to the touch, after 3 hours I dropped it upon picking it up.

    It would be better if the reflector was trimmed, enough to install three luxeon I's and gives a space for a large heatsink

  10. #10
    Flashaholic* Zephyr's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Yeah, I agree with Hondo too. I bought one of these things not too long ago and this thing is quite a thrower itself. It blows away all of my 3W flashlights. I honestly like this lantern a lot, except for the beam that is...
    ZEPH

  11. #11
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    OK, in the name of science, I took my light apart again (not that tough). It is direct drive with a resistor. The resistor in mine is 2.2 ohms. The plastic base for the star looks like if one could duplicate it from aluminum, or better yet copper, would be a good sink for heat, were one so inclined.

  12. #12
    Flashaholic* TORCH_BOY's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Great Idea, to much plastic for my liking

  13. #13
    Flashaholic* monkeyboy's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Thanks for the information Hondo

    If I had the time, I could try fitting a heat sink and replacing that 2.2 ohm resistor with a variable resistor. I would gradually turn down the resistance until the LED blows. Then I could buy a new one and rebuild it with a slightly higher resistance value.

  14. #14
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by monkeyboy
    Thanks for the information Hondo

    If I had the time, I could try fitting a heat sink and replacing that 2.2 ohm resistor with a variable resistor. I would gradually turn down the resistance until the LED blows. Then I could buy a new one and rebuild it with a slightly higher resistance value.

    That's exactly how we build model airplanes for maximum spin. Keep cutting down the vertical stabilizer for more spin until it won't come out of the spin. Then when you rebuild the plane, make it a quarter inch longer than that!

  15. #15
    *Flashaholic* Illum's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by Hondo
    OK, in the name of science, I took my light apart again (not that tough). It is direct drive with a resistor. The resistor in mine is 2.2 ohms. The plastic base for the star looks like if one could duplicate it from aluminum, or better yet copper, would be a good sink for heat, were one so inclined.
    2.2 ohms? I dont recall a resister that registers 2.2 ohms...

    is it a combination of resistors?

    Im thinking of modding my 4D eveready lanturn into a Lux III using the same circuit schemetic as the dorcy

  16. #16
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by Illum_the_nation
    2.2 ohms? I dont recall a resister that registers 2.2 ohms...

    is it a combination of resistors?
    Just one resistor, red-red-gold-gold. According to my Captain America resistor decoder ring, that is 22 divided by ten, or 2.2. No idea where OEM's get that sort of thing, but it seems to be out there.

  17. #17
    *Flashaholic* Illum's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by Hondo
    Just one resistor, red-red-gold-gold. According to my Captain America resistor decoder ring, that is 22 divided by ten, or 2.2. No idea where OEM's get that sort of thing, but it seems to be out there.

    best I can get is 2.5 ohms...thats 4 10 ohm resistors in parallel

  18. #18
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    If you are looking at Radio Shack for resistors to mod the lantern (sneak back on topic) to more or less brightness, I recall more "odd" resistances like this being included in the jumbo assortment pack. I used two tens to get five in my Fenix because, like many, I did not need 100+ various resistors.

  19. #19
    *Flashaholic* Illum's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by Hondo
    If you are looking at Radio Shack for resistors to mod the lantern (sneak back on topic) to more or less brightness, I recall more "odd" resistances like this being included in the jumbo assortment pack. I used two tens to get five in my Fenix because, like many, I did not need 100+ various resistors.
    Well [reflecting this topic] I was going to mod my 6V eveready lanturn into something like this...

    It'll be a waste to but a jumbo pack and use just one...
    Sorry, off topic, back on topic:

    if the relector of the dorcy 3w is slightly marred in a ring by 500 sandpaper, would it soften the beam?

  20. #20
    Flashaholic* Hondo's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Ugh, yeah, the stock beam is a mess of artifacts. As I mentioned earlier, I sputtered mine with clear Krylon. Scuffing it sure would soften the beam, but I am betting the losses would be pretty significant. Some say the sputtering technique is lossy, but I am with those who maintain it just appears that way because light is diverted from dead center to the spill, and total output is not affected that much. A search on "sputtering" should yield several explanations of this, my attempt and others are in this thread:

    http://www.candlepowerforums.com/vb/...ad.php?t=97000

    When I was done, I still had one darker, but even, ring outside the hotspot, everything else was nice and smooth. Much better, and still throws a mile.

  21. #21
    *Flashaholic* Illum's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    For most of us who likes to see the beam perfectly round and smoothm its more of an obsession for perfectness, but if your illuminating something at 100 yards, chances are the beam won't seem imperfect at all

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    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by BlackDecker
    Since it will run on 4 'D' batteries, I wonder how the runtime would be using NiMh AA cells inside 'D' adapters?

    Why buy the adapters seperately, when Energizer already sells the whole thing self containted?


    http://www.energizer.com/products/re...les/sizes.aspx



  23. #23

    Default Re: Dorcy Super 3 Watt LED Lantern

    Sorry to poke this old thread back into service, but does anyone know where I can get one of these lanterns for less than $45 shipped (from BrightGuy)? The price seems a little steep for a light that probably doesn't compare to my simliarly-priced Fenixes...

  24. #24
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    Default Re: Dorcy Super 3 Watt LED Lantern

    I guess nobody got my joke.

  25. #25

    Default Re: Dorcy Super 3 Watt LED Lantern

    Ah... yes... I think I got it.

    Upon closer inspection, the AA, C, and D cells all have the same mAh capacity! I guess they just stuck AAs into adapters and misled us, yes?

    So... where can I get the Dorcy lantern cheaper?

  26. #26

    Default Re: Dorcy Super 3 Watt LED Lantern

    I think I read about a Sears sale for $20 that happened a while ago. Anything like that going on anywhere now?

  27. #27

    Help Re: Dorcy Super 3 Watt LED Lantern

    I almost bought one at BrightGuy, but I didn't want to spend that much. However, I already bought the lantern battery to put in it, and I might buy a 4D MagLED to hold the D cells that come with the Dorcy.

    Any suggestions on where to buy that lantern for a better price?

  28. #28
    Flashaholic* monkeyboy's Avatar
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    Default Re: Dorcy Super 3 Watt LED Lantern

    I Don't think thats such a bad price (37$ + shipping) Remember, this is quite big - that's a lot of plastic you're paying for

  29. #29

    Default Re: Dorcy Super 3 Watt LED Lantern

    Quote Originally Posted by monkeyboy
    I Don't think thats such a bad price (37$ + shipping) Remember, this is quite big - that's a lot of plastic you're paying for
    Well... I still want to pay less ! Any ideas?

  30. #30
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    Default Re: Dorcy Super 3 Watt LED Lantern

    Sears and many other department stores tend to put things on sale in cycles. If it's on sale once, it will be on sale again at some point in the future, just wait until they have it on sale again.

    Quote Originally Posted by TigerhawkT3
    Well... I still want to pay less ! Any ideas?

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