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Old 08-02-09, 10:54 AM   #1
SlimAgainSoon
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18650 tailight

I'm looking for a tailight that, preferably, runs on 18650 battery (or batteries), since I already have a charger and four batteries for my P-7 headlight.

Are there any good ones available?

Thanks for any tips. I'd like to get a tailight before the days start getting short, and that will be here before we know it.
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Old 08-02-09, 12:56 PM   #2
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Originally Posted by SlimAgainSoon View Post
I'm looking for a tailight that, preferably, runs on 18650 battery (or batteries), since I already have a charger and four batteries for my P-7 headlight.

Are there any good ones available?

Thanks for any tips. I'd like to get a tailight before the days start getting short, and that will be here before we know it.
I think buried in this thread you will find a discussion about a red P7.

Dinotte Tail Light Alternative

I picked one up and like it a lot. I do though wish it strobed.
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Old 08-02-09, 01:04 PM   #3
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I think buried in this thread you will find a discussion about a red P7.

Dinotte Tail Light Alternative

I picked one up and like it a lot. I do though wish it strobed.
I found the link to it at Deal Extreme: http://www.dealextreme.com/details.dx/sku.20333
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Old 08-02-09, 02:25 PM   #4
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That's a Lumileds Luxeon K2 emitter in the DX light, according to the specification.

AFAIK, there is no such thing as a red SSC P7 emitter. P7s are available only in WHITE.

http://www.acriche.com/en/product/prd/zpowerLEDp7.asp

SSC makes a P4 series emitter in colors.

http://www.acriche.com/en/product/prd/zpowerLEDp4.asp

Cree makes emitters in colors as well.

http://www.cree.com/products/xlamp.asp
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Old 08-04-09, 02:40 PM   #5
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I think buried in this thread you will find a discussion about a red P7.

I tried, but I couldn't wade through all the hate. I had to bail out of that thread.
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Old 08-05-09, 12:00 AM   #6
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Originally Posted by SlimAgainSoon View Post
I'm looking for a tailight that, preferably, runs on 18650 battery (or batteries), since I already have a charger and four batteries for my P-7 headlight.

Are there any good ones available?

Thanks for any tips. I'd like to get a tailight before the days start getting short, and that will be here before we know it.
I've also been waiting for a bike specific 18650 taillight. As far as I know the only thing remotely suitable is the DX light linked to below, although it doesn't have a flashing mode and might be tricky to mount.
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Old 08-05-09, 12:31 PM   #7
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See this hate-free thread on the Ultrafire WF-501B & flashing drop-in

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Originally Posted by SlimAgainSoon View Post
I think buried in this thread you will find a discussion about a red P7.I tried, but I couldn't wade through all the hate. I had to bail out of that thread.
See the thread Ultrafire WF-501 B works with flashing mode Cree XLamp dropin: Closups & beams. Hate-free, photographs and now even a link to a YouTube video.
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Old 08-05-09, 08:25 PM   #8
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Thanks for the links and the hate-free post. What is it about flashlight discussions that get some people all itchy and scratchy?

Man, can't beat the price on that Ultrafire -- less than $10.

The shipping is probably close to that, if not more.

Sounds like there might be some quality control issues -- but only two comments on the Web site, so hard to say.

It looks like something I could use.

This is very helpful.

Any others out there?
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Old 08-06-09, 01:21 PM   #9
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No, wait -- shipping is free!

I dunno, guys ... I may have to risk a whopping $10 on that one.
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Old 08-12-09, 01:13 PM   #10
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I'm debating about getting that light too. only problems i forsee are, too bright and pisses the drivers off, no secure mounting method, and battery life is too short for a rear light.
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Old 08-12-09, 02:45 PM   #11
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I got the drop in for both of mine. Right now the mounting is done with a lock/bike block. I found the light beam to be far too narrow for a taillight unless you had a really really good place to mount it and then it was still a little too narrow for my taste.

So I shoegoed a small opaque spice bottle to the tip of the thing and run it on medium at night and blink during the day. So far so good and it lasts my entire 3 - 3 1/2 hour round trip commute without a problem.
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Old 08-12-09, 03:19 PM   #12
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Hi evblazer,

could you post a pic of your "diffuser design" ?
Do you mount the light onto the seatpost?

Thanks in advance!
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Old 08-12-09, 05:38 PM   #13
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Spice bottle? That's creative.

Pix for verification!
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Old 08-13-09, 08:52 AM   #14
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Well I guess I'm sorta lucky in that I have an easy mounting area but if you have a rack on your bike so would everyone! I think I saw someone something similar on CPF (candle power forums) a while back to make their flashlight into a lantern or somesuch. At first I tried half of the travel tooth brush holders but that didn't work well for a tail light, it did work well to turn an old flashlight into a good reading and walking around light though.
Here it is my rushed job but it has held together for about 200 miles so far. I have to soak the bottle to get the remaining residue from the label off but here it is!
I have it mounted with lock/bike blocks connected to a pvc bar under my rack. I put cap ends on the PVC and glued them there so the lock/bike block can't slide off since I can't see it.

But what does it look like.. I mean hm
Ok all pics taken with a cell phone camera. I need to take some comparison pics and use a real camera. I have a dinotte and superflash at home. Actually I got these because I'm returning 2 more dinottes because the LED failed on them again. 12+ hour rides most of it in the texas heat and direct sunlight aren't a dinottes friend apparantly.











































From 90 degrees right next to it

45 degrees right next to it

45 degrees and up a few steps back (note the nice no parking paint I lock my bike on top of

About 20ft behind with both lights on medium.

all pics taken with a cell phone camera. The basement parking lot does have lights but it obviously ain't direct sunlight. I'll have to take comparison pics which I could have done with the superflash I have mounted but I was in a rush for a meeting i have in a few minutes.

At first I tried one of those diamond crystal things from the craft store but it didn't work as well as I thought it might. It spread the light and was bright from 90 degrees but the light out the back was all but eliminated.

The jar I got is about 2-3mm bigger where the cap screws on so it takes a little shoegoo filler then it's good. Before I put strap the flashlight in I put the lanyard on the pvc pipe so maybe just maybe if it falls off it'll give warning and I can stop, either that or it may jam in my spokes and kill me I guess hmmm. But the lights are on the outside of the rack so what is the chance of that happening?

Last edited by evblazer; 08-13-09 at 09:05 AM.
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Old 08-13-09, 09:29 AM   #15
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Good job. That side view shows that the bottle makes a difference.

Is there anyplace to buy these in the states? Are they only available through Internet order?

Seems like a bike shop could pick up some business with these.
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Old 08-14-09, 12:31 PM   #16
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I just bought one of these ... http://www.dealextreme.com/details.dx/sku.20333

I'll report back, once it arrives.
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Old 08-29-09, 07:43 PM   #17
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OK, the Ultrafire red light arrived today.

Not nearly as bright as a P-7, which is probably good -- I wouldn't want to be blinding folks back there.

But ... good and bright. Solid construction (it appears -- I've only used it a few minutes).

Smaller than my two P-7 lights by quite a bit.

Should make for an excellent tailight. I will be curious to see the runtime -- and whether it is significantly longer than my P-7 lights.

With this Ultrafire Luxeon K2 on solid (it is off-on, no other modes) and a PB SuperFlash blinking on my fender and another blinking on the back of my helment ... I think you'll see me from behind.
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Old 08-30-09, 01:41 AM   #18
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Quote:
Originally Posted by SlimAgainSoon View Post
OK, the Ultrafire red light arrived today.

Not nearly as bright as a P-7, which is probably good -- I wouldn't want to be blinding folks back there.

But ... good and bright. Solid construction (it appears -- I've only used it a few minutes).

Smaller than my two P-7 lights by quite a bit.

Should make for an excellent tailight. I will be curious to see the runtime -- and whether it is significantly longer than my P-7 lights.

With this Ultrafire Luxeon K2 on solid (it is off-on, no other modes) and a PB SuperFlash blinking on my fender and another blinking on the back of my helment ... I think you'll see me from behind.
How do you plan to mount it?
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Old 08-30-09, 08:52 AM   #19
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I've got a rear rack -- I'll probably just ziptie it on there.

But ... I also bought two cheap flashlight mounts from DX.

I've had good luck, though, with zipties, sometimes using a bit of foam to help with the aim.
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Old 08-30-09, 09:29 AM   #20
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I've got a rear rack -- I'll probably just ziptie it on there.

But ... I also bought two cheap flashlight mounts from DX.

I've had good luck, though, with zipties, sometimes using a bit of foam to help with the aim.
Please let us know how it turns out.
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Old 08-31-09, 06:56 PM   #21
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Ultrafire Red, road test -- Got a good test, as it was raining on the ride home.

No problems at all. Still shining after the wet ride home.

I noticed that drivers were giving me more leeway than before, when I had two Planet Bike Superflashes but no solid light shining rearward.

Two comments today:

"It's piercing bright," said a fellow bicycle commuter, on the way to work.

"Nice lights," said a car commuter, on the way home.
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Old 10-27-15, 07:16 PM   #22
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What tail light did you ended up using ? I'm on the same boat, really wanted a good tail light that could run on 1 x 18650
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Old 10-27-15, 07:43 PM   #23
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I've got the DX red 18650 flashlight. It's mounted with an extra pump mounting bracket I had around. DX also sells a diffuser for a couple of dollars. Mine changes modes when I hit bumps. It is bright.
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Old 10-27-15, 07:52 PM   #24
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What tail light did you ended up using ? I'm on the same boat, really wanted a good tail light that could run on 1 x 18650
SIX-year-old thread......
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Old 10-27-15, 08:02 PM   #25
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What tail light did you ended up using ? I'm on the same boat, really wanted a good tail light that could run on 1 x 18650
I've experimented with some red 18650 flashlights. Mounting is an issue; plus I got bit by the weight weenie bug.

https://www.youtube.com/watch?v=RFxC...IoDLA&index=23

https://www.youtube.com/watch?v=7qVX...6zPoymgKaIoDLA
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