Nice bike light on ebay 24-90V 12w 29.99U$

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 16, 2013 8:04 pm

heathyoung wrote:I'm betting that the 5 X cree are NOT XM-L's, probably XP-G's or something.
My supposed 4x XML light arrived the other day and in a beam shot comparison (2 bikes side by side shooting the same wall) there's barely any noticable difference between the single T6 and my new 4x. Granded the individual reflectors are much smaller but a bit disappointing. I havent measured the current yet, if they are legit emitters I wouldn't be surprised if they're using a cheap, low current driver.
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by heathyoung » May 16, 2013 9:03 pm

A few people have said the same thing unfortunatly.

The may not be XM-L's but XP-G's - been caught with that one myself. What is the power going in? 4 XM-L's at full noise should be at least 40W.

If they are genuine, lets design a nice CC driver for them using a simple switcher HV set up for constant current... So the full 40W is realised :)

The biggest problem with this, however - is keeping it cool when you are pushing it.

I've got a 18W headlight on the front of mine (18W 6 X 3 LED '4wd spotlight' ) its pretty nuts but it is (due to its size) well heatsinked. Makes the single T6 look silly.

Like one of these : http://www.ebay.com.au/itm/18W-12V-6-LE ... 452wt_1014

There is pleanty out there (including light 'bars')

This seems to be a better finished product, for about the same price as well.

http://www.ebay.com.au/itm/12V-LED-CREE ... 5d370ca558

Oooh... I want to replace the 18W with this one :)
http://www.ebay.com.au/itm/New-24W-LED- ... 3449wt_983

And its explosion proof, very important for my builds :)
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by bowlofsalad » May 18, 2013 11:21 pm

GCinDC wrote:
bowlofsalad wrote:did you add a connector to the lights wires?
connector. the CA DC plug is a 5.5 x 2.1mm:
Image
So just run on down to radio shack and grab one of these:
Image
unscrew the housing and solder the light's ends to the terminals. i'm pretty sure polarity matters. can't remember which is which.

my last one melted (for other reasons) and i was just looking for a replacement...
I went to radioshack today and got one of those plugs. I wasn't sure which wire was positive and which was negative on the light, so I used a 9v battery on each wire to be sure. The neat thing was, I knew for sure the light works at that point. For my light, red is positive, blue is negative, the light didn't work the other way around on the 9v. The picture gcindc included (same as the one in my cycleanalyst or CA manual) shows the polarity of the wire/connector coming from the CA.

http://postimg.org/image/kri88ajn3/ After soldering the positive to the inner and the negative to the outer, I plugged it into the CA and turned on the bike. Success, tasty bright light. I was worried about the CA showing negative watts with the light on, I was pleased to see that wasn't the case. However, a different issue presents itself. I was under the impression the light was supposed to consume 12watts, my CA is saying 24-26 (around double what it should be). I've spent the past few hours or so reading and researching all I could. Turns out I need to adjust the rshunt value in my CA, and all this time I thought there was something wrong with my bike giving me such terrible wh/mi. Learning is so much fun.
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 19, 2013 9:02 am

heathyoung wrote:If they are genuine, lets design a nice CC driver for them using a simple switcher HV set up for constant current... So the full 40W is realised :)
Heh sounds good, pedestrians walking at high on unlit bike paths don't need their retinas anyway :P

I looked at some of those bigger format lights but figured they might be a bit too large to be hanging off the bike. Not from a mechanical point of view, just asthetically.

Anyway here's a quick comparison vid of the older generic 12w ebike lights vs a supposed 4 XML-T6 unit
I still haven't had a chance to measure the current yet - I'm stalling on cutting the plugs off and don't have any adaptors.

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 21, 2013 5:24 am

So a little data point on the 4x t6 lights I posted above. Talking to Heath today prompted me to do some testing

It seems the internal driver in these lights is pretty piss poor and is definately holding these back. It feeds the light a steady 12w anywehere from 4.8v up to 9v. It may go more than that but I didn't want to take it too high and blow it in my first round of tests. The supplied battery is a 2S li-ion pack so only 8.4v hot off the charge.
A neat feature is the colour changing button on the back to give you an idea of what the batteries state of charge is like. This is particularly useful as with a driver the light maintains constant brightness throughout until it suddenly shuts off. I was caught out with this a few times with earlier models and this can get you in strife, particularly if late at night if you're suddenly blind or invisible!
As shown fully charged it's green, drops to blue when the pack hits around 7.2v and red when the pack hits 6.6v. This is 3.3v/cell so right around jump off the cliff territory.
When the voltage hits 6v (3v/cell) it starts blinking red but because this uses the honeybadger of LED drivers (it doesn't give a f*ck) it'll keep discharging down to 4.4v (2.2v/cell) before shutting off.

Anyway the take home message in this is that it's only feeding the emitters a wimpy 12w / 1.5A. And this is why it's not noticably any brighter than my single direct driver T6 torch that pulls 2.5a from a single cell.

When I get more time I'll pull the driver out and bypass it, feeding it directly with my variable power supply pictured below and see what it can do with more juice. Hopefully they are geniune T6s and not something with inferior power handling that pops as soon as I stick more wattage into it.

Oh, and after 10 minutes of running on my bench the light case was 34oC - ambient is around 16
4xt6.jpg
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by heathyoung » May 21, 2013 5:59 pm

Not surprising, considering the light output you are getting.

If you could get to the individual LED's we could get a good idea of what they are - I'm still thinking XP-G's somehow, not XM-L.

Maybe this could help: http://www.ebay.com.au/itm/10W-20W-30W- ... 545wt_1224

30W driver would wake it up, dunno about the heat dissipation though!
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 21, 2013 8:05 pm

That's a cute little driver. It's like and itty bitty controller case :lol:
I tried to remove the front of the light to get to the driver/emitters and I couldn't crack it for the life of me. It appears to be glued with the toughest substance known to man and I started scratch up and deform the case wrestling with it in my vice. I'll try again later with some leverage - a multigrip pipe wrench type thing.

In the mean time I accidently fed it 12v while testing (power supply reset to default) and it didnt pop so I guess the driver can take that. That's handy if nothing else for running it off my main 12v DC-DC converter. Light output was slightly brighter with wattage climbing to 18w
Of interest at this voltage even when turned off the driver seemed to allow some voltage 'leak' and the leds glowed very dully. This allowed me to very clearly see the distinct shape of the emitter, which was square (obviously) but with 2 little cut outs on one edge. I'm not sure if that's a useful identifying it.

Otherwise visually this is what the emitters look like. It's not the best pic (taken with my phone) but you can clearly see the 3 wire attachment.
xml.jpg
xml.jpg (41.6 KiB) Viewed 1824 times
That is consistent with the XML appearance based on THIS reference image - vs the XPGs which seem to have 2 distinct wires at the top and bottom.

So yeah, maybe they are legit ? In which case out with the lame driver and pump up the volume :)
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by full-throttle » May 21, 2013 8:58 pm

Hyena wrote:4 XML-T6 unit
Only 4? :lol:

Get some proper lights http://dx.com/p/5-x-cree-xm-l-t6-3000lm ... 650-192065
Image

3000 chinese lm = 1500lm, from what I measured. Still stupidly bright. I always have them on 'low'
Run them off two lipo cells.

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 21, 2013 9:17 pm

Hah, why bother with 2 if you only ever run them on low ? It's all about the symmetry, right ? :P
I was going to run mine on 2S lipo but using a DC converter and just having the one main battery to charge has more appeal.
You measured the current draw on yours ? The casing is identical to mine, just with an extra emitter in the centre. But I notice DX quotes 2.5a which @ 12v is double my driver is supplying
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by full-throttle » May 21, 2013 11:01 pm

From memory the draw is 1.5A @ 8.4V on 'high' on each
Hyena wrote:why bother with 2 if you only ever run them on low ?
sometimes I like to be seen
sometimes I like to send oncoming cyclist a message "your light is too strong"
but it's mostly for showing off :mrgreen:

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 21, 2013 11:23 pm

full-throttle wrote:From memory the draw is 1.5A @ 8.4V on 'high' on each
Ah, ok so same driver as mine and the usual false info from DX...
sometimes I like to be seen
sometimes I like to send oncoming cyclist a message "your light is too strong"
but it's mostly for showing off :mrgreen:
haha I do the same if oncoming cyclists have their lights aimed too high.
Ie:

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by full-throttle » May 21, 2013 11:30 pm

Hyena wrote:usual false info from DX...
full-throttle wrote:3000 chinese lm = 1500lm

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Hyena » May 22, 2013 12:00 am

Lumens I expect exaggeration, you'd think voltage and current would be somewhat accurate.
Mine claims 5200 lumen. LOL
Maybe on a bright sunny day recorded while holding a large magnifying glass up to the sun :P
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by full-throttle » May 22, 2013 12:19 am

Hyena wrote:Mine claims 5200 lumen. LOL
Not likely
Acc to the datasheet the max you can get out of each XM-L T6 is 910lm at a max 3A drive (LED current, not module) so 3,640lm for the 4 LEDs

As I said, 2 chinese lumens = 1lm :roll:

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by friendly1uk » May 22, 2013 5:35 am

In all markets led's are over rated. They try to pass off effective lumen's as actual lumen's. Saying that led's produce a more balanced range of par light, that allows us to see better than the same number from an incandescent. This is of no interest to us though, we want to know our lamp lumen's, Not how many lumen's an incandescent would need to produce to be as much use to us.

I'm waiting to fit white led's at home, but as yet, technology is a long way off what the packet claims. Only at component level do the claims add up. As soon as somebody makes something with them, the lumen's double. I'm sure it's magic.

I still can't find a unit like the thread talks of. Just that one made from kitchen parts which I won't accept. The original was much more professional looking.
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by fechter » May 22, 2013 7:20 pm

I got the "9W" version of the light with 3 LEDs. For only $14 US shipped, not bad. I probably should have gotten two. Definitely NOT waterproof, but looks easy enough to seal up.

Front view:
100_0283.jpg
100_0283.jpg (88.91 KiB) Viewed 1774 times
Rear view:
100_0284.jpg
100_0284.jpg (81.57 KiB) Viewed 1774 times

Cute little dc-dc converter inside:
100_0285.jpg
100_0285.jpg (60.48 KiB) Viewed 1774 times
The front ring unscrews to access the lenses and LED plate:
100_0288.jpg
100_0288.jpg (87.36 KiB) Viewed 1774 times

Initial testing indicates an input power of about 5.5W, not the advertised 9W. Still, it's way brighter than any of my other bike lights. A dual setup would rock. Heatsinking is not the best but I think that will improve when I totally glue the thing with silicone. The angle bracket is sort of cheezy. I might make something nicer. Still, overall I'm pleased with it for the price.
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Tommy L » May 23, 2013 7:49 am

Here is a US seller called LEDstores.
Various wattages from 10watt and up in Round, Square and Lightbars and more...
Request SPOT or FLOOD

Build quality looks good and he even has videos that show light working under water! :)

http://stores.ebay.ca/LEDstores/27W-LED ... 2866699010
ImageImage

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by sabongi » May 23, 2013 1:21 pm

Is there any light that can be directly plugged to the CAv3 besides the lumenator?

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by fechter » May 23, 2013 1:52 pm

sabongi wrote:Is there any light that can be directly plugged to the CAv3 besides the lumenator?
The one I got runs off 12v-85v so could tie into the battery wires going to a CA (hmm... good idea).
BTW it was listed here: http://www.ebay.com/itm/Super-9w-led-he ... _692wt_806
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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by full-throttle » May 31, 2013 3:00 am

DX sell 6x XM-L T6 now :mrgreen:
Image

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by bowlofsalad » May 31, 2013 8:42 am

sabongi wrote:Is there any light that can be directly plugged to the CAv3 besides the lumenator?
You might read back a page or so, or search 'cycleanalyst', (a 2.3 version) I just got done setting up exactly this idea with a 12w ebay light. A lot of people such as yourself use abbreviations innapropriately, making using the search function or even ctrl+F difficult to impossible. You cannot search the abbreviation CA and nobody is going to search CAv3.

Anyway, I used the 12w light with my cycleanalyst (CA), it works great. I got the plug from radio shack, figured out which wires are positive and negative on the light using a 9v battery, soldered things up accordingly and plugged it together lickety split. There are other ways of accomplishing this task but it seems like it's worked like real well.

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by lifepo4ever » Jul 06, 2013 8:43 am

full-throttle wrote:DX sell 6x XM-L T6 now :mrgreen:
Image
run the 3x cree-xm-l-t6 version with a 3s lipo and never get warm so a guest this will also run no problem with a 3s :twisted:

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by lifepo4ever » Jul 06, 2013 8:48 am

full-throttle wrote:DX sell 6x XM-L T6 now :mrgreen:
Image
run the 3x cree-xm-l-t6 version with a 3s lipo and never get warm so a guest this will also run no problem with a 3s :twisted:

I also chek with my wattmeter and it draw less current with the 3s its very strange maybe because there volt limiter or something

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by Supertux1 » Jul 06, 2013 9:01 am

I have one of the $25 1000 lumen ones from Amazon and the wide angle beam lens, and it's plenty bright:

http://www.amazon.com/gp/product/B005WPXNQ6

Of course, you need one of these to go with that light:

My Commuter/Cargo eBike (MAC 10T): https://endless-sphere.com/forums/viewto ... =6&t=51147
My Off-Road eBike (Bafang BBS02 '750W'): https://endless-sphere.com/forums/viewto ... =6&t=61721

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Re: Nice bike light on ebay 24-90V 12w 29.99U$

Post by lifepo4ever » Jul 06, 2013 10:56 am

Supertux1 wrote:I have one of the $25 1000 lumen ones from Amazon and the wide angle beam lens, and it's plenty bright:

http://www.amazon.com/gp/product/B005WPXNQ6

Of course, you need one of these to go with that light:

lol

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