50 Bright white LED's of a 12v7ah battery

[adriaand]

I want to know if i can make a sort of spotlight with 50 LED's.
Do i run 10 of them in series at a time then 5 parralel strips?
Wil it work with just a resistor ?
What resistor?
Will it last about 5 hours?

Thanks in advance

 

[Reloadron]

Unless you can provide some specific LED specifications (like linking to a data sheet) it is rather impossible to answer your questions. No, you are not likely to run 10 in series on a 12 volt battery. You need to understand the forward voltage drop of LEDs and their current ratings. Things like forward voltage and forward current are needed? Specifications?

Ron

 

[mithun385]

yeah even i wanna know the same thing how many leds can i use if each led having a max value of 3.5v and 25mA current and the voltage source is a 12v dc battery? if u know the answers plz draw me a circuit and upload it here plz its really urgent

 

[RMMM]

yeah even i wanna know the same thing how many leds can i use if each led having a max value of 3.5v and 25mA current and the voltage source is a 12v dc battery? if u know the answers plz draw me a circuit and upload it here plz its really urgent

**broken link removed**

Go there. For source voltage, use 12
for diode forward voltage use 3.5
for diode forward current use 25

and for the last box, just enter the # of leds you want to use, and click the "schematic" button, then click "design my array"

It will give you a schematic. Keep changing the # of leds in array to get as large as you want.. until the amperage gets to the size that you can handle.

 

[mithun385]

ah thanks really helpfull thanks