Halfords LED Spotlight £8

LONG_KEELER

LONG_KEELER

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East Coast
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http://www.halfords.com/car-seats-t.../halfords-1-million-candlepower-led-spotlight


Bought one today.

1 million candle power.

Comes with 4 AA batteries which last for 4 hours. Also takes other batteries.

Build quality a bit spotty but very powerful spotlight.

The range from my back garden is about 150 yards and it gives a halo of light near you at the same time. Nice and lightweight too.

Best light I have ever had. Will it last ? who knows...............
 
Dab said:
Having just bought a Cateye Volt 700 front bike light for £80, I would be very surprised if for $14 this Ultrafire torch came anywhere near 1800 Lumens.
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I have GOT to be doing something wrong. 800lm for the Cateye at £80 and you have to recharge it, but I have been making 1100 lumen lights for myself and for flooding the garden running on AA cells for cheap cheap prices. I have even printed 3-D enclosures for some. Wish I could get into mass manufacture.
 
I've had a couple of such spotlights including one rechargeable, I used them for getting along our (difficult) creek at night. However, the batteries were always flat when I really needed a light. So I now have a cheapo car inspection spotlight on a long lead that plugs into 12V, and it always works.
 
Sailingsaves said:
I have GOT to be doing something wrong. 800lm for the Cateye at £80 and you have to recharge it, but I have been making 1100 lumen lights for myself and for flooding the garden running on AA cells for cheap cheap prices. I have even printed 3-D enclosures for some. Wish I could get into mass manufacture.
Click to expand...

Which LED(s) are you using?
 
Dab said:
Having just bought a Cateye Volt 700 front bike light for £80, I would be very surprised if for $14 this Ultrafire torch came anywhere near 1800 Lumens.
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Agreed, but the Cateye isn't putting out 700 either. The torch I posted has a Cree XP-L led, which is a step above those mentioned by the poster above. Your cateye is not as bright and costs several times more...
 
dmjburrows said:
Agreed, but the Cateye isn't putting out 700 either. The torch I posted has a Cree XP-L led, which is a step above those mentioned by the poster above. Your cateye is not as bright and costs several times more...
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The torch you link to is an excellent buy and some of the smaller torches are very good too, but I think 1800 lumens is a tiny exaggeration as you say, but still better than the Cateye, as you also say. Cree state 1226lm max for the XP-L

http://www.cree.com/LED-Components-and-Modules/Products/XLamp/Discrete-Directional/XLamp-XPL

Can't believe people pay £80 for a Cateye.

Also I encourage people to buy decent Li-ons and chargers with those torches.

http://www.candlepowerforums.com/vb/showthread.php?280909-Ultrafire-18650-3000mA-exploded

I use AA rechargeables mostly.

Thanks Dylan, remember it has a life time guarantee. I visited a life raft service station to learn bits and bobs about life rafts and they want to stock the torch now - wish I could mass manufacture rather than sit hunch backed, breathing in solder fumes hour on end... but it is fun.
 
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I visited a life raft service station to learn bits and bobs about life rafts and they want to stock the torch now - wish I could mass manufacture rather than sit hunch backed, breathing in solder fumes hour on end... but it is fun.[/QUOTE]

If you have a product you can sell then I urge you to get it made for you. I ran a sub contract manufacturing business for years and this has allowed many practical people to get things made to merchantable quality and build a business. The country needs people to start more enterprises especially those that make things. .

I have retired now but can probably put you in touch with folks who can help. P. M Me if you want help with this.
 
RobBrown said:
What about a product like this one? Looks good value to me, good performance, reasonably waterproof & has 12v charging & AAAs option.

http://www.ebay.co.uk/itm/2200LM-XM...15301099&tpos=unknow&ttype=price&talgo=origal
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2200 lumens? Bit doubtful. Be careful. Not cheap either compared to the ebay light below (4 of the same Leds for £6 more)

4 of the Cree XM-L T6 LEDs here are quoted to give 5200lumen. 5200 / 4 =1300 lumens per LED
http://www.ebay.co.uk/itm/4-CREE-XM...ght-Bicycle-Head-lamp-Headlight-/251288567677
And this uses 4 times as many batteries as the other Ebay one.

However in reality: Cree state up to 1040 Lumens for XM-L:
http://www.cree.com/LED-Components-and-Modules/Products/XLamp/Discrete-Directional/XLamp-XML
 
I have difficulty understanding the way in which the brightness of these various lights, lanterns and torches is expressed.

the Halfords lantern at the head of the thread is said to be 1 million candle power and the specification says it's 120 lumens

now we are talking about bicycle light that are 5200 lumens .......... that makes them over 43 million candle power ??????

Can someone explain the relationship between lumens and candle power?
 
VicS said:
I have difficulty understanding the way in which the brightness of these various lights, lanterns and torches is expressed.

the Halfords lantern at the head of the thread is said to be 1 million candle power and the specification says it's 120 lumens

now we are talking about bicycle light that are 5200 lumens .......... that makes them over 43 million candle power ??????

Can someone explain the relationship between lumens and candle power?
Click to expand...

Quoted from here: http://www.surefire.com/flashlighttechnology

Light Output — Lumens vs. Candlepower
Some manufacturers dramatize the performance of their illumination tools by measuring output in candlepower units. This measurement can be misleading because it is usually taken by focusing the beam into a narrow cone and taking the measurement in this bright spot, without respect to the overall beam configuration.

Imagine a flashlight whose beam produces an extremely bright spot six inches in diameter when shone against a wall fifteen feet away, but which produces almost zero illumination elsewhere on the wall. A candlepower measurement taken in that bright spot may be quite high, but the flashlight’s beam would be useless for most purposes.

Now imagine taking the total amount of light in that bright central spot and spreading it out evenly into a broad cone. The beam is now in a much more useful configuration, but if you measured candlepower at the same place on the wall where the bright spot was previously you’d get a much lower figure, and the beam as a whole might appear too dim for your needs.

This is why the best starting point for comparing the performance of illumination tools is the lumen, which measures total light output. This puts the illumination tools you’re comparing on a level playing field; you know how much total light you’re getting from each one. After that, the primary performance concerns are (1) beam configuration, meaning the shape of the tool’s emitted cone of light and how the available light is distributed within that cone; and (2) efficiency, meaning how much energy is required to produce the lumens emitted in that cone of light.

A technical note: although candlepower and lumens measure different things, there is a relationship between them. A light source with an intensity of one candlepower (or candela in modern terminology) that is emitting equally in all directions (that is, in a spherical shape) generates about one lumen per steradian. A steradian is a solid conical shape that can be envisioned as a circular cored-out section of a sphere, wide on the surface of the sphere and narrowing to a point at the center. Since there are about 12.5 steradians in a sphere (4π to be exact), that means our one-candela light source is producing a total of about 12.5 lumens of light.

Also this?
http://onlineconversion.vbulletin.n...lculate/3350-comparing-lumens-and-candlepower
 
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