Bigger battery just lasts longer.
That’s the h (hour) in mAh 
wow
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 
3. Sorry but no photos. It was not my light and it was returned quite some time ago.
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.?. Page Not Found - Aliexpress.com
5) So, what are ur views on this New DP LED 760 WHich I am thinking of …?
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.
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 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.
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
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).“”“””
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.: Luminous Flux
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
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…
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.
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!
That depends.
I recently received and modded this $12.— headlamp
I put a depolished, slightly wider lens in it along with an XP-G2.
Zoomed out it’s a flood without edges, so you don’t have a beam that moves with your head.
I think a wide flood TIR would be best though.
But fleabay also has cheaper headlights, also with built in charger and stuff.
So how many mA flows per led over here… And how much is the power of the flashlight in watts… Can someone calculate out for me and show me here…
This is getting awkward :davie:
Yes, Farhaj it’s probably around and about 0.7 Watt and probably some 40 Lumens
Devide it by 12 when you want to know how much per LED.
This has all been said and done by others in the previous posts in this topic.
It’s 12 ‘strawhat’ LEDs. Very cheap.
You would better buy this then:
It’s $4.80 and has built in charger also.
Looks like 1 Watt LED about 70 Lumen.
Now stop asking the same questions.
Did u check the data sheet I sent earlier… http://underwaterseaplants.awardspace.com/led.pdf …
Also the Battery in it is they say have the datasheet here: http://underwaterseaplants.awardspace.com/battery.doc ….
The company claims that the output is between 90-100 Lumens … how is this possible… so thats why I opened the light and got the datasheets for led and the battery from them… they also claim that it has 1 watts power output as written on the outside box… Now, they also claim they have a 3Watts Light as well… so I want to be more sure about its power and lumens before buying it… so, first can you clear out this for me about the first light…
I want to know and use the light for fishing