DP-LED 722b

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farhaj
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DP-LED 722b

I would like to know The Lumens Intensity this Light Produces and the mA it consumes to produce that much Lumens. It is from DP (china).

SOURCE: AMAZON IMAGES BELOW:

Farhaj

Edited by: farhaj on 04/09/2014 - 09:46
MRsDNF
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This may help.

 

Product Features:

100% brand new head lamp

Cute design, portable with adjustable strap, easy to use

Energy-saving with super bright and powerful LED

Widely used for camping, hiking, fishing, biking and so on

Also a good friend at home for emergency use

Long useful life with built-in rechargeable batteries of 800mAH capacity

Just plug the cable adapter into a wall socket for charging about 12 hours

With indicator to show the working condition

Can be used circularly more than 500 times

Adjustable light angle about 90°with protective pad, flexible and comfortable

On/off switch with 2-mode for selection:

--- First, 5 LED bulbs illuminate for Max 14 working hours persistently after fully charged

--- Second, 9 LED bulbs illuminate for Max 8 working hours persistently after fully charged

Perfect gift for outdoor enthusiasts

Working temperature: -10℃~40℃

Working humidity: less than 90%

Rated voltage: AC90~240V 50Hz

Rated current: AC0.07A 0.6W

Light source power: 0.7W

Cable length: 70cm

Note: if no use for long time, please charge it about 8 hours every 3 months once; the MAX charging time is less than 24 hours for protection

Size: 98 x 62 x 76mm (L x W x H)

Color: item will be sent in random color

Net Weight: 243g

Package Contents:

1 x Headlamp

1 x US Charger Cable

1 x Strap

This is straight from the web site. I cannot vouch for the honesty of the specifications.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

farhaj
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MRsDNF wrote:

This may help.

 

Product Features:

100% brand new head lamp

Cute design, portable with adjustable strap, easy to use

Energy-saving with super bright and powerful LED

Widely used for camping, hiking, fishing, biking and so on

Also a good friend at home for emergency use

Long useful life with built-in rechargeable batteries of 800mAH capacity

Just plug the cable adapter into a wall socket for charging about 12 hours

With indicator to show the working condition

Can be used circularly more than 500 times

Adjustable light angle about 90°with protective pad, flexible and comfortable

On/off switch with 2-mode for selection:

—- First, 5 LED bulbs illuminate for Max 14 working hours persistently after fully charged

—- Second, 9 LED bulbs illuminate for Max 8 working hours persistently after fully charged

Perfect gift for outdoor enthusiasts

Working temperature: -10℃~40℃

Working humidity: less than 90%

Rated voltage: AC90~240V 50Hz

Rated current: AC0.07A 0.6W

Light source power: 0.7W

Cable length: 70cm

Note: if no use for long time, please charge it about 8 hours every 3 months once; the MAX charging time is less than 24 hours for protection

Size: 98 × 62 × 76mm (L x W x H)

Color: item will be sent in random color

Net Weight: 243g

Package Contents:

1 x Headlamp

1 x US Charger Cable

1 x Strap

This is straight from the web site. I cannot vouch for the honesty of the specifications.

AMount of Lumens it Produces and the mA it consumes during ON is NOT mentioned.. Also, I would like to know the Voltage Drop on these Type of LEDs and the type of LED it is..

Farhaj

MRsDNF
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You have asked a couple of similar questions in different threads. If we know exactly what you want members here may be able to help you more. You link to a light and ask the same question which unless someone has tested the light no one knows the answers to your questions. If you use the search function and dont find an answer I'd say your chances of getting an answer would be slim.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

farhaj
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so, here does it mean that none has used it and I getting a positve feedback for it is narrow…

Farhaj

djozz
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farhaj wrote:
so, here does it mean that none has used it and I getting a positve feedback for it is narrow...

It seems so. But if you may decide to buy one, we would certainly be curious about your findings about the light Smile

Jerommel
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It’s only available (as far as I can tell) at Ali’s, for too much money and (you guessed it) strawhat LEDs and a plastic lens…

farhaj
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djozz wrote:

farhaj wrote:
so, here does it mean that none has used it and I getting a positve feedback for it is narrow…

It seems so. But if you may decide to buy one, we would certainly be curious about your findings about the light Smile

I already have one.. I bought 2 of those..But, I want to know all the specs of it so the next time I buy a new one I know what I want exactly.

That’s why I want to know the type of LED they are using and the Voltage DRop in each LED. THere are 12 LEds in it. and they claim they have 800mAH battery in it. so I wanted to know does it really produce 1 Watts output (as per their claim)..
If, anyone can tell me how to measure it and calcualte all the findings thats more helpful… ALso, want to know the VOltage produced by that 800mAH battery and lumens..

Farhaj

farhaj
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HEre is a photo of the outside Box I got..see, if u can help me more with it..

Farhaj

djozz
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If the (limited) specifications are correct, and the 'light output' of 1W really means the power input of the leds (that is often the case) you can typically expect about 80 lumen from this light (give and take 25 lumen). If you want to know the exact output, you must have the light measured by an expert.

The given charge numbers (0.5W, 0.08A) suggest a battery voltage between 5 and 6 V, so I would not be surprised if a common phone battery is used for this light.

Can you make a (sharp!) close-up picture of the front of the light, showing the actual leds? I would expect generic chinese 5mm leds, but who knows?

farhaj
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djozz wrote:

If the (limited) specifications are correct, and the ‘light output’ of 1W really means the power input of the leds (that is often the case) you can typically expect about 80 lumen from this light (give and take 25 lumen). If you want to know the exact output, you must have the light measured by an expert.

The given charge numbers (0.5W, 0.08A) suggest a battery voltage between 5 and 6 V, so I would not be surprised if a common phone battery is used for this light.

Can you make a (sharp!) close-up picture of the front of the light, showing the actual leds? I would expect generic chinese 5mm leds, but who knows?

I could not Understand your Part for “”(that is often the case) you can typically expect about 80 lumen from this light (give and take 25 lumen)”“.. why do you say that from 80 to 50 Lumes..

Such big difference.. Let me give you a close look up for the LEDS in it..

Farhaj

farhaj
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Here are some more Photos to Tell me more details about the LEDS and the Lumens please if Possible.



Farhaj

djozz
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thanks for the photo's. There is not much more to tell, i'm afaid. They look indeed like (generic chinese) 5mm leds, expect maximum output of 10 lumen/led that is maximum 120 lumens. It should run for a few hours on a battery load.

I hope that is all you want to know, without having the light in my hands to do measurements that is all I can tell.

farhaj
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It says that it has a 800 maH battery in it.. If I install a higher mAH battery in it; can it give a higher Lumens Power Light.. Or the LED’s may fuse out of the higher Current. Any details guys..

Farhaj

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Hi Farhaj,

I have repaired one of these. I will explain some details below:

Emitter:
This uses cheap 5mm emitters. By eyeball, I estimate brightness is around 20 – 30 lumens. IMO you cannot push more light out of these emitter without burning them.

Battery:
It had an unconventional battery – a single 4V Lead-acid. Very rare choice of battery – normally for LA batteries standard 6V is used. You cannot swap it with a Li-ion and expect the charger to work. You will need major conversion – 18650 holder, new charging socket both male/female, and a new Li-ion charging board.

In my opinion, too much work, not worth modding. You can easily grab a cheap XRE/XPE headlight for under $10 nowadays. For bit under $20, you can get XMLs And if you can spare $30, there’s a Crelant CH10 offer now which I think is a great value.

http://budgetlightforum.com/node/30290

Hope this helps.

farhaj
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Pulsar13 wrote:
Hi Farhaj,

I have repaired one of these. I will explain some details below:

Emitter:
This uses cheap 5mm emitters. By eyeball, I estimate brightness is around 20 – 30 lumens. IMO you cannot push more light out of these emitter without burning them.

Battery:
It had an unconventional battery – a single 4V Lead-acid. Very rare choice of battery – normally for LA batteries standard 6V is used. You cannot swap it with a Li-ion and expect the charger to work. You will need major conversion – 18650 holder, new charging socket both male/female, and a new Li-ion charging board.

In my opinion, too much work, not worth modding. You can easily grab a cheap XRE/XPE headlight for under $10 nowadays. For bit under $20, you can get XMLs And if you can spare $30, there’s a Crelant CH10 offer now which I think is a great value.

http://budgetlightforum.com/node/30290

Hope this helps.

Yes, I am thinking of getting a nEw one but I need to know the complete specs of flashlights before I go for buying one..

ALso, can you tell me here :

1) You say 20-30 Lumens. Is it for the whole entire 12 LEDS or a single LEd.. Also, One Guy on the top said assume 80 Lumens as a whole .. how do u say or get to it.

2) It says in the Specs that Cahrging Voltage is 90V -240 V and Charging Current is AC 0.08A and 0.5W… If I do the math with P=VI; then P should equal to ~ 220V * 0.08A = 17.6 Watts.. not 0.5 Watts as in the Specs.. What is wrong around here… can anyone explain it to me..

3) If you can show me your repairs or photos of yours with the battery and all would be great..

waiting for your reply anxiously..

Farhaj

Jerommel
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Bigger battery just lasts longer.
That’s the h (hour) in mAh Wink

djozz
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Pulsar13 wrote:
Battery: It had an unconventional battery - a single 4V Lead-acid. Very rare choice of battery - normally for LA batteries standard 6V is used. You cannot swap it with a Li-ion and expect the charger to work.

wowSurprised

Pulsar13
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1. That was an estimate for the whole light. I fixed the light, tested it, and returned it months ago. My estimate is based on that. Feel free to give or take 50% or something as this is based on memory. But pretty sure it does not come anywhere near 80lumens.

2. Again, you can should drop your belief on Chinese spec. You said it yourself, the maths don’t add up. You’re right. That means spec is wrong. This happens almost 100% of the time with cheap chinese light. Don’t pull your hair over it Smile

3. Sorry but no photos. It was not my light and it was returned quite some time ago.

farhaj
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djozz wrote:

Pulsar13 wrote:
Battery: It had an unconventional battery – a single 4V Lead-acid. Very rare choice of battery – normally for LA batteries standard 6V is used. You cannot swap it with a Li-ion and expect the charger to work.

wowSurprised

1) What do you mean by LA Batteries over here.. for that is LA used or how..
2) Can a higher Battery make the LEDs Glow more or they would fuse out (in general)…
3) What is the Voltage Drop for the 5mm Chinese LED like that.
4) Also Now I am thinking of buying this Flash Light from the same COmpany. IT says it is 5W and 4800mAH..and a single Led. WHat type of LED could that be.?. http://www.aliexpress.com/item/Dp-760-series-double-lithium-battery-led-...

5) So, what are ur views on this New DP LED 760 WHich I am thinking of ..?

Farhaj

djozz
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Based on the above: don't buy it, buy a real headlamp.

For 30 dollars you can buy something really nice, for inspiration, check www.fasttech.com, search for any headlamp with a Cree led, there are a lot of headlamps that run on 3x AAA batteries, those are really common and you can use regular rechargable batteries.

Pulsar13
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farhaj wrote:
1) What do you mean by LA Batteries over here.. for that is LA used or how.. 2) Can a higher Battery make the LEDs Glow more or they would fuse out (in general)... 3) What is the Voltage Drop for the 5mm Chinese LED like that. 4) Also Now I am thinking of buying this Flash Light from the same COmpany. IT says it is 5W and 4800mAH..and a single Led. WHat type of LED could that be.?. http://www.aliexpress.com/item/Dp-760-series-double-lithium-battery-led-... 5) So, what are ur views on this New DP LED 760 WHich I am thinking of ..?

1. It's just one of many types of rechargeable batteries - LA(Lead Acid), Li-ion, NiMH etc. Each types normally has different charging requirement, cannot be mixed.

2. No, higher capacity will only give more runtime. Higher voltage battery (e.g 6V LA) will make it go poof.

3. Vf for cheap emitter normally just slightly lower than 4V.

4 & 5. Why are you partial to this company? Those cost only $10 around here, and that's retail. No way I'm paying $30 for it. All plastic, generic emitter, battery of unknown origin, WEIRD SPEC - first it's 5W, scroll down and it's 3W - also "GREEN" body and later mentions black.

The Crelant I mentioned will beat it to pulp in everything for same price.

If you really want a good $30 value for money, by my opinion, it's would be this $6.50 headband, an XML C8 on top (ebay/Ali $10), and a couple flooders on the side ($3 cheapie host + $4 XML emitter). That's my current setup, and I never want to go back to single headlamp.

farhaj
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I got in touch with this comapny..

1) I asked for their datasheet for the LED.. I am attaching along.. NOw I want to know the total lumens produced by 1 LED. then I will know the total Lumens produced by the 12 LEDs..

2) can someone see the datasheet for the LED and tell me how much LUmens is produced per LED.. THey claim it over all 90-100 lumens is produced per Headlamp.

LED Datasheet

Farhaj

Firelight2
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The datasheet unfortunately doesn’t say how many lumens are produced per LED. Instead it only refers to intensity in millicandela. Intensity is a measure of how bright the emitted light is at its hotspot. It tells you how well the LED throws. But unfortunately doesn’t tell you total lumens. A very throwy, focused light might have high intensity and low lumens. A very floody light might have high lumens and illuminate a wide area… but have low intensity and not throw very far.

Since the datasheet doesn’t say, that leaves us with experience. These are very generic cheap Chinese 5mm LEDs. Typical output is usually 5-10 lumens per LED at the emitter… less actually emitted out the front (OTF). So previous estimates others have given of 80 lumens sound in the ballpark.

However, if they are driven less hard than they could be or if they are at the lower end of the output spectrum (5 lumens), total output might be lower. The only way to tell is to take measurements or compare the light to others. This is where actually handling the light comes in. A previous poster mentioned he’d actually handled and repaired this same model of light and total output was around 20-30 lumens. Frankly, I’d take that hands-on observation as more accurate than an 80 lumen guess.

It is routine for cheap flashlight manufacturers to inflate their rated lumen outputs. It’s highly likely that the spec listed on the light is much higher than the actual output.

If you want a more accurate estimate of the total lumens from this light, you’ll need to send it to someone with the proper equipment for testing.

farhaj
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Firelight2 wrote:
The datasheet unfortunately doesn’t say how many lumens are produced per LED. Instead it only refers to intensity in millicandela. Intensity is a measure of how bright the emitted light is at its hotspot. It tells you how well the LED throws. But unfortunately doesn’t tell you total lumens. A very throwy, focused light might have high intensity and low lumens. A very floody light might have high lumens and illuminate a wide area… but have low intensity and not throw very far.

Since the datasheet doesn’t say, that leaves us with experience. These are very generic cheap Chinese 5mm LEDs. Typical output is usually 5-10 lumens per LED at the emitter… less actually emitted out the front (OTF). So previous estimates others have given of 80 lumens sound in the ballpark.

However, if they are driven less hard than they could be or if they are at the lower end of the output spectrum (5 lumens), total output might be lower. The only way to tell is to take measurements or compare the light to others. This is where actually handling the light comes in. A previous poster mentioned he’d actually handled and repaired this same model of light and total output was around 20-30 lumens. Frankly, I’d take that hands-on observation as more accurate than an 80 lumen guess.

It is routine for cheap flashlight manufacturers to inflate their rated lumen outputs. It’s highly likely that the spec listed on the light is much higher than the actual output.

If you want a more accurate estimate of the total lumens from this light, you’ll need to send it to someone with the proper equipment for testing.

Is their any formula to calculate mathrmatically the lumens from the data of mcd and angle given in the datasheet

Farhaj

farhaj
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See this PAge.. Where it says a weighting should be applied.. here is the Link,..

http://www.compuphase.com/electronics/candela_lumen.htm
this is what it refers to,,,

“”“Evaluation

The outcome of the equations (and the calculators based on them) may differ from the data given by a LED or spotlight manufacturer, or from what you measure with a Lux meter, for several reasons. The manufacturer may specify the luminous intensity (in candela or milli-candela) perpendicular to the light source, instead of the average value over the apex angle. Another complexity is that the values for candela, lumen and lux are standardized for light with a wave length of 555 nm, or green light. For LEDs of a different colour, a weighting function should be applied, using a standardized model of the human eye. Standard Lux meters have, at best, only filters for daylight and incandescent light, and may therefore deviate significantly for LEDs (even white LEDs, as the spectrum is not the same as for incandescent lamps).”“”“”

Farhaj

farhaj
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Also, IS it true one can calculate the lumens through this formula:

Luminous flux in lumens = Radiant power (watts) x 683 lumens/watt x luminous efficacy

it says here in this LINK.: http://hyperphysics.phy-astr.gsu.edu/hbase/vision/lumpow.html

So what would be the Lumens for the LED 5mm in the specs given in the Datasheet by this forumula . can anyone help…
Datasheet: http://underwaterseaplants.awardspace.com/led.pdf

Farhaj

farhaj
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I want to know the Lumens output of 1 LED in the Flashlight..

I will post the schematics as well here.. if that can help more..







Farhaj

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4V accu, 33ohm inseries with each led, at 3V for the led, 1V for the resistor, that is 30mA, so max 10lm per led still sounds plausable.

Advice of obtaining better headlamp still applies..

Pulsar13
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djozz wrote:

4V accu, 33ohm inseries with each led, at 3V for the led, 1V for the resistor, that is 30mA, so max 10lm per led still sounds plausable.

Advice of obtaining better headlamp still applies..

Assuming the Vf is 3V, the emitter If at 3V = 6.6mA per spec. Nothing much at all. That’s 20mW per emitter, or 240mW total.

Regular sub-$10 ebay XML lights gives out 40x as much power if that is the case.

Farhaj, let’s just admit that this light gives low output? No need to scratch the head too much over how much lumens it gives.

B42
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Pulsar13 wrote:

1. It’s just one of many types of rechargeable batteries – LA(Lead Acid), Li-ion, NiMH etc. Each types normally has different charging requirement, cannot be mixed.

2. No, higher capacity will only give more runtime. Higher voltage battery (e.g 6V LA) will make it go poof.

3. Vf for cheap emitter normally just slightly lower than 4V.

4 & 5. Why are you partial to this company? Those cost only $10 around here, and that’s retail. No way I’m paying $30 for it. All plastic, generic emitter, battery of unknown origin, WEIRD SPEC – first it’s 5W, scroll down and it’s 3W – also “GREEN” body and later mentions black.

The Crelant I mentioned will beat it to pulp in everything for same price.

If you really want a good $30 value for money, by my opinion, it’s would be this $6.50 headband, an XML C8 on top (ebay/Ali $10), and a couple flooders on the side ($3 cheapie host + $4 XML emitter). That’s my current setup, and I never want to go back to single headlamp.

I completely agree with getting another headlamp instead of debating how many (few) lumens that one produces. Almost anything you buy that he mentioned above will be much better, and if you want a really good one, get the Armytek headlamp from Illumination supply, with the discount its only $80 I think and its up to 1010 lumens.

With the headband idea though…Im not sure what you use it for, but if you are moving around using it like for hiking, for me the headband is absolutely annoying and not very workable, the lights move around/get blocked, feel funny and change directions…not a good idea unless you are using it and not in motion!

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