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12v 15w led spotlight

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12v 15w led spotlight

Post by Liew on Sat 2 Jun 2012 - 0:14

Help...
If I use 3s 3000mah Lipo on 12v 15w led ,
How long can it last ?
How to calculate ?

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Re: 12v 15w led spotlight

Post by boolean21 on Sat 2 Jun 2012 - 0:39

Power = I x V
I (current) = Power / Voltage = 15W / 12V = 1.25Amps

So each LED will draw 1.25A.... If you use a 1250mAh battery, assuming no losses and best efficiency... It will last for 1hr...

Correct?
You got the specs of the LED?

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Re: 12v 15w led spotlight

Post by laneboysrc on Sat 2 Jun 2012 - 7:58

Boolean21 already made the calculation: run-time should be approx 2.5 hours on a 3S 3000 mAh.

One thing to take care of is HEAT. 15W in the tiny package of an LED requires a serious heat sink.

Is this for an RC model? 15W LED light is equivalent of ~75W incandescent -- that's an awful lot of light for an RC car!

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Re: 12v 15w led spotlight

Post by Teck on Sat 2 Jun 2012 - 8:48

Haha the diy king got something in his head again Idea n i think i know wat he is up to Twisted Evil

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Re: 12v 15w led spotlight

Post by slow on Sat 2 Jun 2012 - 9:08

Very very Bright spot light coming up.. .. .. bounce bounce sunny sunny

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Re: 12v 15w led spotlight

Post by ket2175 on Sat 2 Jun 2012 - 12:42

Liew u wanna shine what? Why need so bright spot light hehe. Razz

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Re: 12v 15w led spotlight

Post by RTECH on Sat 2 Jun 2012 - 16:55

15W!!!! LED Shocked Wah piang!

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Re: 12v 15w led spotlight

Post by Liew on Sat 2 Jun 2012 - 17:04

No lah ! For my mtb night ride !
Last night got a group young rider suddenly turn on they spotlight when near me , KNN cannot see the road ! Lucky no fall down !
So search the spotlight for bike , so exp .
Now wan to buy car use spotlight n use 3s or 4s Lipo ! Normal 3AA high power led light Ard 200Lumen . Car use spotlight up to 1600Lumen ! If can use will mod to my mtb !

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Re: 12v 15w led spotlight

Post by boolean21 on Sat 2 Jun 2012 - 17:09

Woah... HID for your mtb!

Post your mtb photo in the member's rides section! Nice bike! Smile

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Re: 12v 15w led spotlight

Post by Teck on Sat 2 Jun 2012 - 17:34

Hahaha n i thought i know wat u r going to do n up it for your mtb Embarassed Liew is the girl u cannot see in the dark isiz that y need sunny sunny sunny

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Re: 12v 15w led spotlight

Post by Liew on Sat 2 Jun 2012 - 18:40

Ha ha

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Re: 12v 15w led spotlight

Post by oceanic on Sat 2 Jun 2012 - 19:44

Liew wrote:No lah ! For my mtb night ride !
Last night got a group young rider suddenly turn on they spotlight when near me , KNN cannot see the road ! Lucky no fall down !
So search the spotlight for bike , so exp .
Now wan to buy car use spotlight n use 3s or 4s Lipo ! Normal 3AA high power led light Ard 200Lumen . Car use spotlight up to 1600Lumen ! If can use will mod to my mtb !

Eh good idea leh! cheers

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Re: 12v 15w led spotlight

Post by wyetuck88 on Sat 2 Jun 2012 - 21:41

Get a flashlight with 3x XML bulb la....confirm as bright as a car HID or even brighter...

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Re: 12v 15w led spotlight

Post by wyetuck88 on Sat 2 Jun 2012 - 21:42

Get a flashlight with 3x XML bulb la....confirm as bright as a car HID or even brighter...

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Re: 12v 15w led spotlight

Post by Liew on Sat 2 Jun 2012 - 22:52

12v 15w led car use spotlight + shipping below $20 only !

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Re: 12v 15w led spotlight

Post by oceanic on Sat 2 Jun 2012 - 23:08

Car spotlight is too big for MTB leh tio bo. Im using a bike LED for my MTB, but doesnt seems really bright. And the shine area is small.

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Re: 12v 15w led spotlight

Post by Liew on Sat 2 Jun 2012 - 23:13

From eBay


Brand new and high quality
This auction is for 1 pc Sliver spotlight
Ultra bright 3-LED waterproof spotlight
New version using top brand CREE leds
LED life span over 50000 hours
5W each LED of total 15W output,1200 Lumens
53mm (2.10") diameter x 85mm (3.3") in length
The diameter of the handlebar mount is 25mm
Working voltage is 12VDC
Anodized sliver aluminum alloy light body
Wire length is about 23 inches

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Re: 12v 15w led spotlight

Post by RTECH on Sun 3 Jun 2012 - 11:23

Smile Wah seh, Liew into mountain biking sia! Liew , you need any leg protection guard let me know. I have a set for sale.

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Re: 12v 15w led spotlight

Post by Liew on Sun 3 Jun 2012 - 13:59

so many years no ride bike
now have to learn , go on road first , cannot go trail now , no off road skill Embarassed

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Re: 12v 15w led spotlight

Post by oceanic on Sun 3 Jun 2012 - 15:10

Liew find 1 day, we ride together. Very Happy

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Re: 12v 15w led spotlight

Post by wyetuck88 on Sun 3 Jun 2012 - 15:42

Where you guys stay and ride around?

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Re: 12v 15w led spotlight

Post by Liew on Sun 3 Jun 2012 - 15:51

oceanic wrote:Liew find 1 day, we ride together. Very Happy
ok ! But I slow lol!

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Re: 12v 15w led spotlight

Post by Liew on Sun 3 Jun 2012 - 15:52

wyetuck88 wrote:Where you guys stay and ride around?
I at ghim moh .

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Re: 12v 15w led spotlight

Post by oceanic on Sun 3 Jun 2012 - 15:54

Liew wrote:
oceanic wrote:Liew find 1 day, we ride together. Very Happy
ok ! But I slow lol!

Me also slow. Old already, no stamina to go fast. Very Happy

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Re: 12v 15w led spotlight

Post by oceanic on Sun 3 Jun 2012 - 15:56

wyetuck88 wrote:Where you guys stay and ride around?

Sembawang Very Happy

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Re: 12v 15w led spotlight

Post by RTECH on Mon 4 Jun 2012 - 17:57

No My bicycle is a road bike, cannot go offroad.

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Re: 12v 15w led spotlight

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