12V LED light bulb

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Joachim2011
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12V LED light bulb

Hi guys

I need a diffuse light source to light up pitch dark spaces. So i'm thinking about making a battery powered 12V LED car light. Since motorcycle batteries are too heavy and expensive I want to try it with a battery pack of rechargeable AA Ni-MH or Li-ion cells. My concern is that the battery won't last very long. What would be the best power source for this LED light? Can I calculate the estimated life of the battery? Would I need other parts to make this combination work?

This is the light I had in mind

DX

http://www.dealextreme.com/p/g4-1-2w-110-lumen-3500k-25-smd-led-car-warm-white-light-bulb-dc-12v-51140

 

Thanks for your time!

 

Joachim

MixoMaxo
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Hi, welcome

is not clear.. you need to light a place in your car? why don't just make

a parallel connection from car's battery? Taking it from a light or the lighter is very easy

MOD...

Sry reading again I think that you don't need it in your car xD

 

well to calculate the autonomy you must take in consideration the power of the light(taking the DX light 1.2Watt) and the energy of the battery that is measured by the mid voltage(nimh have 1,2volt litio 3,7 volt) X the electric charge(an AA nimh have ~2300mAh and a litio 18650 have ~2500)

 

so a nimh AA can give 1,2x2300= 2,7watt for 1hour

 

and a litio 3.7x2500=9250mWh that are 9,25 watt for 1h

 

than with a 18650 litio u can light that DX's light for ~7,7 hours(ofc u need a mod coz is droved for a 12v or use a pack of 3X18650 in serie with an autonomy of 23h)

...You should clear where and how you want use that light if you want help, for example if are for external  you can consider solar panel etc... or just buy a flashlight with a diffuser on top Silly

Joachim2011
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Thanks for the fast answer. I do a lot of photography in underground places (bunkers etc) therefore I need a light with enough autonomy but bright enough to light up a room.

So with 3 x 18650 batteries I get 10.8V and would not need a mod. Would the light be bright enough, since it's not running at 12V?

MixoMaxo
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than I suggest you a flashlight with 18650 batteries carrying extra spare cells with you

+ a diffuser

some exemples to get an idea, not good deals

http://www.ebay.it/itm/SIPIK-CREE-Q3-3m-175lumen-LED-Flashlight-Diffuser...

just a diffuser

http://www.ebay.it/itm/Flashlight-Diffuser-Ultrafire-502B-Torch-6P-L2-50...

or home made diffuser with traslucent film case

 btw let's w8 the experts here I'm a newbe xD

you need few light to walk and give an help in focusing to your camera or a daylight? xD

the led of 1,2 watt on DX is like a 5 watt halogen you can light just a shoes box xD

...another thing usually flashlight make an cool white light tell us first if you need warm tint like the light on dx

Joachim2011
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MixoMaxo wrote:

 

 btw let's w8 the experts here I'm a newbe xD

you need few light to walk and give an help in focusing to your camera or a daylight? xD

the led of 1,2 watt on DX is like a 5 watt halogen you can light just a shoes box xD

...another thing usually flashlight make an cool white light tell us first if you need warm tint like the light on dx

 

That's a great idea, thanks! The bulb doesn't need to give much light. I just need some warm light to create an atmosphere. I work with long exposures anyway, so on a 30sec exposure any light will look bright. 

edc
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Or buy a lantern that fits a 504. Should be plenty of light for your purpose

 

http://i1193.photobucket.com/albums