Totally lost about flash lights and powers

holian

Newly Enlightened
Joined
Apr 13, 2011
Messages
8
Dear Masters,

I would like to buy flash light for my bike (for night riding). But more i read than more i lost in informations.

I know that all information about flash light can be found in this forum somewhere...

I really need help about some question, and need advice about a few flash light.

I'm thinkin' about this type of flash light:
- http://www.dealextreme.com/p/ultraf...ed-flashlight-with-clip-1-18650-1-17670-36357
- http://www.dealextreme.com/p/ultraf...d-flashlight-with-strap-1-18650-1-17670-36356
- http://www.dealextreme.com/p/aurora...2-mode-900-lumen-led-flashlight-1-18650-15691
- http://www.dealextreme.com/p/ultraf...00-lumen-white-led-flashlight-1-x-18650-57006
- http://www.dealextreme.com/p/aurora...5-mode-900-lumen-led-flashlight-1-18650-32589
- http://www.dealextreme.com/p/fandyf...d-flashlight-with-strap-black-1-x-18650-57985


So. I can't decide about this lights above. It seems every light have SSC P7 or SSC p7-C led. So what else matter?
The last light what i linked (FANDYFIRE) seems the same as ULTRAFIRE wf-501b but almost half price. What do you think about it?

I mostly would choose from the FANDYFIRE ('coz i can buy two for $3X) and the other is the ULTRAFIRE 1200lm (XM-L)[/B]

And a few question about the power of this type of lights:

- what mean secured battery?
- i have many 2000-2400mAh (AA alklaine type-size) battery. May i use this batteries or the ultrfire batteries (18650 or 17670 ) has different size?
- may i use my battery charger or i have to buy one ultrafire battery charger?

Thank you for crystalize my mind!

Holian
 

LEDninja

Flashlight Enthusiast
Joined
Jun 15, 2005
Messages
4,896
Location
Hamilton Canada
:welcome:

There is a subforum for bicycle lights here;
http://www.candlepowerforums.com/vb/forumdisplay.php?86-Bicycle

All the flashlights you linked to use lithium ion batteries which can be very dangerous if not handled properly. :poof: Not AA.
http://www.candlepowerforums.com/vb/showthread.php?262234-TK-Monster-Explosion
http://www.candlepowerforums.com/vb/showthread.php?280909-Ultrafire-18650-3000mA-exploded
Before buying and using these batteries read the instructions on their safe use:
http://www.candlepowerforums.com/vb...-Using-Li-ion-cells-in-LED-flashlights-safely
You will need to buy batteries and a charger.

The batteries can be grouped as follows:
-Flat top (flat both ends) - more capacity but may not work with some flashlights.
-Button top (button on +ve, flat on -ve) - the button takes up room so less capacity.
-
-Not protected - These cells have no protection so may explode if charged to too high a voltage, explode if current is too high, explode if the voltage gets too low gets damaged and you try to charge them.
-Protected - These have a circuit board at the bottom that shuts the battery down if it sees high voltage (4.2V+) high current (2C) or low voltage (2.7V-). They do not always work well so always practice safe battery handling even if you have a protected battery.
Many protected batteries from DX are made so big that they do not fit flashlights and chargers. Suggest you get your batteries from AW.
http://www.cpfmarketplace.com/mp/showthread.php?230876-AW-s-LiIon-Batteries-Sales-Thread-*Part-12*

Li-ion battery sizing
18650 => 18-65-0 => 18mmØ*65mm L*round (not square like a 9V battery)
Protected batteries are longer because of the circuit board.
The 17670 is smaller and give you less runtime.

DX lights:
Get a good one - works great.
Get a so-so one - works for a week or 2 then dies.
Get a bad one - dead on arrival.

The FANDYFIRE is a new brand I have not seen before. But it is priced too low. I would wait 6 months to se if there are any complaints. You get what you pay for.

I worry about the XM-L. The Vf is very low and can draw too high a current increasing the chance of an explosion. It will use up your battery very fast (<45 minutes).

None of the lights are actually 900 lumens or 1200 lumens.
Look at the current number.
2000 mA => ~400 lumens. So 3000 mA=> ~600 lumens.

Those small bodies can not handle the heat of 3000 mA (~10W) for extended periods of time and will get too hot to hold. Not a problem as yours will be mounted and not hand held.
 
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holian

Newly Enlightened
Joined
Apr 13, 2011
Messages
8
Thank you very much for your exhaustive answer. I will not buy anyone of it.

May i ask you to suggest me a light (500+ lm)?

i would really apperitiate.
 

RedForest UK

Flashlight Enthusiast
Joined
Nov 28, 2009
Messages
1,365
Unfortunately a 500+ lumen light running on AA's will be pretty expensive and also set you back for a good charger and Ni-mh cells (eneloops). To get a good output it'll probably also be a little big for your liking.

I would recommend you take a look at the dedicated 'magicshine' bike light options, DX sells them and they are good output and decent quality, you get the battery pack and charger included, although being pretty cheap for what they are they won't be perfectly reliable.


There are many options for bright, good quality AA lights, but you would probably have to step out of the budget section to get what you wanted.
 

slipe

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Joined
Jul 12, 2009
Messages
78
Location
Tampa Bay barrier island
At this point, I don't know if it makes a lot of sense to get a P7 light anymore. The XM-L is just a lot better for flashlights.

I recently got a XM-L T6 and it is probably typical. It is blazingly bright, but it is a thrower. My little Spiderfire P7 is still my bump in the night light. The wide even flood is quite good for looking around and I would think it would also be good for a bicycle. I have a couple more P7s that don't quite have as even a flood as the Spiderfire, but they are all very floody. Beamshots I've seen from other XM-Ls are also throwers.
 

RedForest UK

Flashlight Enthusiast
Joined
Nov 28, 2009
Messages
1,365
An XM-L with a smaller reflector can flood much better than a P7. Some XM-L lights are throwers simply because they can be, it's a smaller die size so easier to collimate, but it's even easier to just let it be a flooder, see a P60 XM-L drop-in for more flood.
 

Mike_TX

Enlightened
Joined
Oct 26, 2009
Messages
225
An XM-L with a smaller reflector can flood much better than a P7. Some XM-L lights are throwers simply because they can be, it's a smaller die size so easier to collimate, but it's even easier to just let it be a flooder, see a P60 XM-L drop-in for more flood.

+1. My XM-L drop-in is a definite flooder, as have been most of the examples I've seen on CPF. I would guess that an XM-L designed to throw would REALLY throw, though, since it's got a lot of horsepower.

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