Which flashlight for 8+ hour runtime as nightlight for the kids?

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Aleister
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Which flashlight for 8+ hour runtime as nightlight for the kids?

Hello fellow crazy flashacholics Smile

I am trying to solve all kinds of possible (or impossible) problems and one of them is this:

1. You drive your car through a snowstorm and, at some point, road is closed and you can't go any further. It is night, very dark and kids are crying because they are afraid and can't see a thing. You have your blankets, water and snacks but how do you light the car until morning so the kids can calm and sleep?

or

2. No electricity at all for, say, 10 days. How do you light children's bedroom at night?

 

So the problem is: I need are a couple of lumens just to light a room or a car. The solution should stay on for 8+ hours without overheating and with no need for battery change. It also should be safe for unattended use in a kids room (out of reach of children of course).

 

The possible solutions that come to mind are:

1. Chemical light. (which is reliable enough to trust it will light up and holds for 8+ hours? These should not be China - no quality control - made because I don't trust Chinese with chemicals if they don't have a daddy over their head). On the other hand, a China made chemical light sold officially in EU or US is perfectly acceptable.

2. iTP A3 EOS (or iTP A2 EOS). Can they stay on for 8+ hours on low?

3. 22000 mcd DX keychain lights. Can one stay on for 8+ hours?

4. Typical 9 led flashlights. I forgot one of them on for more than 24 hours and it was still emitting light. But I hate to trust one of them as they are extremely unreliable.

5. ???

 

The solution should be budget enough to purchase at least 2 of them (so best if under $25 but can go up if needed). Also, I prefer the solution to work with easy to get AA/AAA batteries but it is not absolutely necessary.

 

Please enlighten me! Smile

Let a flooder be my wife and a thrower be my mistress

Davx
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I'm not sure but i think a 18650 light, not overdriven, in low mode can last 8 hour. I never made a test like this. Maybe you can calculate runtime with battery capacity and power consumption.

A R2 or a R5 with a (good) 18650 could do the job.

If we already have the BLF Zombie Edition i think that "moon mode" would be the solution

"There are always new jobs, women, and apartments......there is only ONE BLF." - Chicago X (27/03/2012)

Don
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You'll get 35 hours out of a not very good 18650 from an MRV clone on low.

Something like a Fenix E01 would work.

I'll put a charged NiMH AAA in my A3 and see how long it runs. Expect a result in quite a few hours.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Aleister
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Davx wrote:

I'm not sure but i think a 18650 light, not overdriven, in low mode can last 8 hour. I never made a test like this. Maybe you can calculate runtime with battery capacity and power consumption.

A R2 or a R5 with a (good) 18650 could do the job.

If we already have the BLF Zombie Edition i think that "moon mode" would be the solution

Is zombie edition's specs finalized? Hmm, I think I should read that thread more extensively. Thank you DavX!

Let a flooder be my wife and a thrower be my mistress

Aleister
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Don wrote:

You'll get 35 hours out of a not very good 18650 from an MRV clone on low.

Something like a Fenix E01 would work.

I'll put a charged NiMH AAA in my A3 and see how long it runs. Expect a result in quite a few hours.

I stopped checking MRV clones thinking that "I have enough big 18650 lights" but if it has a low like this, I will check it again.

How do we calculate how much a flashlight will stay on knowing the battery capacity and the Amperage draw? If I know this, I can check every flashlight I have and calculate which can work for 8 hours.

Thank you Don!

Let a flooder be my wife and a thrower be my mistress

SirJohn
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A bit more expensive, but my R01 XM-L only draws 20ma on low so it should last over 100 hours on low and it can be recharged in the car if you buy the car adapter. Of course, you could always just find a lantern for this sort of thing as that is what they were designed for. Something like this, though I know you probably can't get this particular one in Greece:

http://www.amazon.com/Rayovac-SE3DLN-Sportsman-300-Lumen-Lantern/dp/B0018S4XIS/ref=sr_1_1?s=sporting-goods&ie=UTF8&qid=1308403838&sr=1-1

On 3 d cells that thing will last a very long time.

 

Edit: I just remembered that the C3 SS 3-mode version at manafont should do more than 8 hours on low no problem:

http://www.manafont.com/product_info.php/ultrafire-full-stainless-steel-c3-cree-q5-3mode-led-flashlight-aa14500-p-4045

 

Davx
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I think we have to wait to have the Blf zombie edition...

btw, you can calculate (hypothetic) runtime dividing battery capacity by flashlight draw. Obviously you have to consider the REAL capacity of the batteries (Some 3000mah batteries are 2300mah) and the protection circuit that  doesn't allow to fully drain your battery. Try to read some review on the forum and you can find many example.

"There are always new jobs, women, and apartments......there is only ONE BLF." - Chicago X (27/03/2012)

dimeotane
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This topic is very interesting to me as well.  Here's a couple threads I've been discussing this topic as well.

Long run time lights 

I know there are many headlamps that run for 20 hours+ on low ie.  Petzl Tikkina 2, Coleman Axis, Princeton Tec, or Black Diamond

Also, theres the Camping Lantern I bought that runs for 20 hours on low with 3AA. It's excellent for camping, but a bit big for your pocket.


 

 

 

 

 

 

 

 

okwchin
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Look for low current draw on the tailcap in low mode.

 

My D10 will draw 40mA on a NiMH (50 hours) , and 7mA on a 14500 (100 hours) on low of about 1-2 lumens. 

Ask boaz for his nitecore EX10s, on a low of about 3 lumens that should give you about 50 hours on a 16340 (guessing here)

"like everyone else - I’m looking for my next “last” flashlight" -  ohnonothimagain

Aleister
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Some very good ideas here!

I checked the specs of some of my flashlights and some of them seem to gladly stay on for many more than 8 hours on low (iTP A3, iTP A1, Sunwayman V10R, Fenix TK-35). Also, E1320 reports on dimeotane's thread that EDI-T P4 also can stay on "forever" so I think my EDI-T T11 with electronic infinite variable control will also do the job (with lower runtimes due to 16340 batteries it uses but still enough for 8+ hours).

And, I understood what I should understand by words alone... Mah = Ma per hour (thanks DavX), I hope I got it right this time Tongue out

I think I will measure the Ma draw of some of my lights on low and publish it here so we can calculate some runtimes. Will this be useful to anyone?

Let a flooder be my wife and a thrower be my mistress

agenthex
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Get this http://budgetlightforum.com/node/2890#comment-46681.

 Literally days of runtime.

Reading this makes you smarter: http://lesswrong.com/

Boaz
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The nitecore EX-10 is 6 hours at 35 lumens   and 65 hours at 3 lumens ..

the ezAA is  like 15 to 20 at 15 lumens

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Don
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The ITP A3 is still running after ten hours on low with an 800mAh AAA.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Colonel Light
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Aleister wrote:

The possible solutions that come to mind are:

1. Chemical light. (which is reliable enough to trust it will light up and holds for 8+ hours? These should not be China - no quality control - made because I don't trust Chinese with chemicals if they don't have a daddy over their head). On the other hand, a China made chemical light sold officially in EU or US is perfectly acceptable.

2. iTP A3 EOS (or iTP A2 EOS). Can they stay on for 8+ hours on low?

3. 22000 mcd DX keychain lights. Can one stay on for 8+ hours?

4. Typical 9 led flashlights. I forgot one of them on for more than 24 hours and it was still emitting light. But I hate to trust one of them as they are extremely unreliable.

5. ???

 

5. Get your kids to overcome their fear of the dark Silly

Aleister
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Don wrote:

The ITP A3 is still running after ten hours on low with an 800mAh AAA.

I think we have a winner here. Budget, tiny, uses easy to get batteries, stays on for more than 10 hours and it has a keychain so we can hang it easily from a nail on the wall or a car's rearview mirror.

 

Don, is it really hot after ten hours on low?

Let a flooder be my wife and a thrower be my mistress

2100
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Actually, any XP-G AA light on Alkaline/NiMH/Panasonic Oxyride on low will go on for quite a number of hours. On photo lithiums it will probably be crazy.   On a Xeno E03 XM-L, it is only 0.03A on a NiMH, enough light/spill to read a A4 sized magazine in total darkness.  It will probably go on for 80hrs, and then slowly dim to unusable levels.

 If you want runtime and ability to use primaries/NiNH, AA is better than AAA.  AAA is optimised for size.

How about Ultrafire U-20/U-30?

okwchin
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with 10 hour runtime, off a AAA, its going to barely be a a couple degrees above ambient.

 

A AAA Battery will have what, 1Watt of total energy? Spread that over 10 hours, thats 0.1watt of output. Assuming all of that turns into heat, thats 0.1 watts of energy that must be dissipated through the torch. What can we guess the thermal resistance of the torch to the environment to be? 15? 20 degrees per watt? thats a thermal increase of 1.5-2 degrees per watt. (talking centigrade)

If you were running high on a XP-G, say 3 watts of heat is being dissipated, then the torch will heat internally to some 50-60 degrees C above ambient, but off a AA, thats under an hours runtime off a good AA cell. (assuming perfect internal thermal design... hehe)

"like everyone else - I’m looking for my next “last” flashlight" -  ohnonothimagain

okyeung
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SirJohn just find you a good deal.  http://budgetlightforum.com/node/2890

 http://www.newegg.com/Product/Product.aspx?SID=u0t3032849f9fp0dd0c0s701&AID=10440897&PID=1225267&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-cables-_-na-_-na&Item=N82E16882276006.  

Model
Brand
Icon Light
Model
RG102A
Specs
Features
High-strength aluminum body with open architecture design; effectively dissipates heat and fits comfortably in the hand

Durable power-regulated LED maximizes output and runtime; never needs replacing

Micro-textured reflector creates a smooth, powerful beam

Ergonomic "clickie" tailcap switch allows for easy switching between two output levels

Powered by one AA alkaline battery; included

Sealed with O-rings; waterproof to one meter for 30 minutes.
Specifications
Light output: 50/6 lumens

Runtime: 3/70 hours

Length: 4.5 inches

Weight: 3.8 ounces

Waterproof: up to 1 meter

Battery: one AA alkaline

3