Bike Forums

Bike Forums (http://www.bikeforums.net/forum.php)
-   Electronics, Lighting, & Gadgets (http://www.bikeforums.net/electronics-lighting-gadgets/)
-   -   Cheap, powerful rear light? (http://www.bikeforums.net/electronics-lighting-gadgets/519548-cheap-powerful-rear-light.html)

AEO 03-22-09 09:10 PM

you can't use blinking tail lights in the UK or most of Europe as far as I'm aware. (I know someone will correct me on this)

use both for best effect. one flashing to get attention, and another solid to allow people behind you to get a good judgement on how fast they are gaining on you.

for in-city use, PB super flash is one of the best in this regard.

Ziemas 03-22-09 11:18 PM

Quote:

Originally Posted by AEO (Post 8579365)
you can't use blinking tail lights in the UK or most of Europe as far as I'm aware. (I know someone will correct me on this)

use both for best effect. one flashing to get attention, and another solid to allow people behind you to get a good judgement on how fast they are gaining on you.

for in-city use, PB super flash is one of the best in this regard.

You in fact are wrong. It's Germany (perhaps there is another country or two also) that has goofy light regulations.

Unknown Cyclist 03-23-09 06:13 PM

Quote:

Originally Posted by Ziemas (Post 8579923)
You in fact are wrong. It's Germany (perhaps there is another country or two also) that has goofy light regulations.

Blinkies are legal in the UK, but only if the blinky is a secondary light OR hasn't got a steady mode and meets other requirements, like light output and correct mounting.

I don't know about goofy light regs, but I suspect Germany is pretty much the same as the rest of Europe....

:)

My red Ultrafire WF-501B arrived today.

Firstly, it's BRIGHT !!

Here's some measurements, with a fresh battery:

Current draw at battery = 850 mA
Voltage measured at LED = 3.56V
Weight = 137g inc. battery

I put a fresh battery in at 7.33pm and the torch ran continuously until 11.30pm.

So the runtime is 4 hours less a few minutes on a single 18650.

I'm very happy with it and it fits the Fenix mount perfectly.

Luckily the Fenix mount also fits my seatpost very well, a fairly traditional 27.2 mm.

Build quality is very good, torch can be easily disassembled.

Seems well regulated, gets warm but not hot.

Not much else I can say really, cheap and lots and lots of red light.

:)

Unknown Cyclist 03-23-09 06:17 PM

Quote:

Originally Posted by martinrjensen (Post 8579225)
If your light doesn't blink, you blend in with the surroundings. The blinky aspect makes you stand out and that's the whole reason for a light. This is not an opinion, it's fact. If your tail light doesn't blink, it's not as good, period. Get a Planet Bike SuperfFash. It's all you need. If you want more, get 2. You will get nothing better, you can get brighter, but not better.

Rather than argue whether any particular light is as good, blinky or not, I'd just like to point out that I've just upgraded and now have a mudguard light, two PBSF on the seatstays, two multicolour lights on the rear carrier, two b-spoke on the seatpost and two round blinkies are going on the saddle.

Some of these are on solid, some on flash and I'm just adding a high power rear light as we speak :D

I'm not sure I'm going to blend in with the surroundings.

Blinkies are fine, but on their own they aren't 'better' than a fixed light.

A single blinky can be very difficult for a motorist to get a fix on.

;)

AEO 03-23-09 07:08 PM

Quote:

Originally Posted by Ziemas (Post 8579923)
You in fact are wrong. It's Germany (perhaps there is another country or two also) that has goofy light regulations.

yes, thank you for the correction.

I knew there was at least one country which required no blinking tail lights.

Unknown Cyclist 03-23-09 07:16 PM

Quote:

Originally Posted by AEO (Post 8585505)
yes, thank you for the correction.

I knew there was at least one country which required no blinking tail lights.

:)

Not really a correction as I don't know what regs different countries have.

In theory, most of europe should be in harmony.

:thumb:

erlebo 03-23-09 07:27 PM

Quote:

Originally Posted by Unknown Cyclist (Post 8585116)
Some of these are on solid, some on flash and I'm just adding a high power rear light as we speak :D

I'm not sure I'm going to blend in with the surroundings.

Blinkies are fine, but on their own they aren't 'better' than a fixed light.

A single blinky can be very difficult for a motorist to get a fix on.

;)

Be careful, this unknown cyclist had flashing lights and it appears that a motorist got a fix on him.

http://www.youtube.com/watch?v=mEccxPPwXmI

Unknown Cyclist 03-23-09 08:03 PM

Quote:

Originally Posted by erlebo (Post 8585661)
Be careful, this unknown cyclist had flashing lights and it appears that a motorist got a fix on him.

http://www.youtube.com/watch?v=mEccxPPwXmI

"This video is not available in your country."

erlebo 03-23-09 08:10 PM

Quote:

Originally Posted by Unknown Cyclist (Post 8585930)
"This video is not available in your country."

Maybe this one.

http://www.youtube.com/watch?v=-a--Pc7R8PU

Ziemas 03-24-09 12:34 AM

Quote:

Originally Posted by Unknown Cyclist (Post 8585581)
:)

Not really a correction as I don't know what regs different countries have.

In theory, most of europe should be in harmony.

:thumb:

No, Germany has it's own regulations which are under the StVZO regulations. Below is a translation of them.

http://www.toytowngermany.com/wiki/R...t_for_bicycles

Unknown Cyclist 03-24-09 01:32 AM

Quote:

Originally Posted by Ziemas (Post 8587234)
No, Germany has it's own regulations which are under the StVZO regulations. Below is a translation of them.

http://www.toytowngermany.com/wiki/R...t_for_bicycles

"Required equipment for bicycles - Munich"

Munich is in Bavaria, not Germany.

:lol:

Ziemas 03-24-09 01:36 AM

Quote:

Originally Posted by Unknown Cyclist (Post 8587287)
"Required equipment for bicycles - Munich"

Munich is in Bavaria, not Germany.

:lol:

Are you here just to argue? Are you so arrogant that you can't possibly imagine that you perhaps are mistaken? The StVZO regulations are for the whole of Germany.

Unknown Cyclist 03-24-09 01:46 AM

Quote:

Originally Posted by Ziemas (Post 8587291)
Are you here just to argue? Are you so arrogant that you can't possibly imagine that you perhaps are mistaken? The StVZO regulations are for the whole of Germany.

;)

Actually, I'm not here just to argue I posted details of the new red Ultrafire from DX (this is the Cheap, powerful rear light thread) - did you read it ?

:)

pdxsteve 03-24-09 03:24 AM

Ok, Mr. Unknown beat me to the punch because I was too lazy (and busy) with ski patrol last weekend. he provided a good baseline report, mine will be less technical and more observational.

1. Full runtime on mine was 3h45m. I don't think my battery was fully charged, however.

2. The o-rings are cheap. I already trashed the tail cap o ring. Off to the hardware store.

3. Highly visible in daylight. Just what I wanted.

4. My LED was not perfectly centered, but WHO CARES. I'm not using this as a flashlight.

5. The Led unit is a drop in and you could replace it with another drop in if you wanted to use it as a flashlight. Double duty! Bonus.

6. My wife thinks I'm going to attract airplanes (my commute takes me past Portland International).

7. It was 10 dollars!

8. If encouraged, I would still be willing to take pictures of daytime and nighttime compared to my Niterider rear light and Superflash.


pdxsteve

Unknown Cyclist 03-24-09 04:04 AM

Quote:

Originally Posted by Ziemas (Post 8587291)
Are you here just to argue? Are you so arrogant that you can't possibly imagine that you perhaps are mistaken? The StVZO regulations are for the whole of Germany.

Ok..as you seem to be upset...I'd better explain...

This icon :lol: indicates a joke is being made.

In post #78 I said
Quote:

I don't know about goofy light regs, but I suspect Germany is pretty much the same as the rest of Europe....
In post #81 I said
Quote:

Not really a correction as I don't know what regs different countries have.
I stated clearly twice that I don't know, does that really sound like I am being arrogant about it, or even arguing ?

To quote Wikipedia:

German-Bavarian relations
Quote:

It is a common joke in Germany that Bavaria is not part of Germany. In fact a minority seriously agrees with this notion; the Bayernpartei (Bavaria Party) advocates Bavarian independence from Germany. It is important to note that Bavaria was the only state to reject the West German constitution in 1949.
I think you might have overreacted slightly, which is understandable, as many people don't realise that Bavaria was a separate country until comparatively recently.

:thumb:

ilovebicycling 03-24-09 09:40 AM

Quote:

Originally Posted by pdxsteve (Post 8587405)
Ok, Mr. Unknown beat me to the punch because I was too lazy (and busy) with ski patrol last weekend. he provided a good baseline report, mine will be less technical and more observational.


8. If encouraged, I would still be willing to take pictures of daytime and nighttime compared to my Niterider rear light and Superflash.


pdxsteve


Yes Steve! If you would be so kind as to take some night/day photos of your light. I'm sure many of us here including myself would love to see some beam shots.

RepWI 03-24-09 10:05 AM

Quote:

Originally Posted by ilovebicycling (Post 8588819)
Yes Steve! If you would be so kind as to take some night/day photos of your light. I'm sure many of us here including myself would love to see some beam shots.

Yes,please do....

And if I might add to ilovebicycling's request, please note the name of the light and model. It has gotten buried in the discussion.

Unknown Cyclist 03-24-09 11:17 AM

Quote:

Originally Posted by RepWI (Post 8589006)
please note the name of the light and model. It has gotten buried in the discussion.

It's a torch "Ultrafire WF-501B Philips Luxeon K2 Red LED Flashlight"

http://www1.dealextreme.com/producti...ku_20333_1.jpg

And very good too, I might add :thumb:

AEO 03-24-09 12:02 PM

nearly 4hrs is really good run time for a light that runs on only one battery.

Ziemas 03-24-09 12:07 PM

Quote:

Originally Posted by AEO (Post 8589863)
nearly 4hrs is really good run time for a light that runs on only one battery.

The real question is how much of that four hours is usable light? I'd be interested in the runtime to 50% output, which is how lights are usually rated.

Unknown Cyclist 03-24-09 12:08 PM

Quote:

Originally Posted by AEO (Post 8589863)
nearly 4hrs is really good run time for a light that runs on only one battery.

I reckon it took about 1/2 hour for the torch to get warm and stayed warm for maybe 3 hours, cooling down for the last part of the discharge.

Obviously because either the board is working less hard or the LED is.

So it's likely that if used on short journeys the total runtime could be slightly longer.

Pity they don't do a 2 x 18650 version....

:)

AEO 03-24-09 12:14 PM

or some cold weather testing. I find I only get 90% of regular output power and run times when I'm riding the P7 in under -2c conditions.

AEO 03-24-09 12:17 PM

Quote:

Originally Posted by Unknown Cyclist (Post 8589522)
It's a torch "Ultrafire WF-501B Philips Luxeon K2 Red LED Flashlight"


And very good too, I might add :thumb:

can we just call them luxeon K2 red? or just K2 red?
makes my life easier to not have to say the whole name.

RepWI 03-24-09 01:56 PM

Quote:

Originally Posted by AEO (Post 8590010)
can we just call them luxeon K2 red? or just K2 red?
makes my life easier to not have to say the whole name.

Thanks Unknown for the pic above a few posts.

The reason I asked for a repeat of the name is this:

I lurked here for some time before making a series of purchases that moved me from generation one to generation two lights. But to be able to do so, I had to follow a number of conversations that became a bit confusing.

Therefore, the reason I asked for the product name to be mentioned was so others could easily pick up on the work you people were advancing. Make sense?

And thanks for your efforts.

Unknown Cyclist 03-24-09 03:05 PM

Quote:

Originally Posted by Ziemas (Post 8589904)
The real question is how much of that four hours is usable light? I'd be interested in the runtime to 50% output, which is how lights are usually rated.

Well, it has a driver so the light output is very nearly constant.

As the battery voltage drops the current draw increases so that the watts supplied to the LED remains the same.

With a fresh battery the voltage is high and the current draw is low.

With a tired battery the voltage is lower and more amps are taken from it to compensate.

This enables the driver to keep the current (and therefore the voltage) at the LED the same.

Having said that, before the LED went out I shone it on a white surface, then when it went out I did the same immediately after fitting a fresh battery and it was a little brighter.

Maybe the when the battery is nearly depleted it can't supply enough amps to keep the wattage the same and then the output drops ? I don't know for sure, more run tests and measurements required.

I'd say that if the light output did drop as low as 50% before going out, it must have been in the last 2 or 3 minutes.

:)

Hope this helps....


All times are GMT -6. The time now is 03:48 PM.