What kind of battery do I need to buy for this spotlight and it will work on arduino without any problems ?
Would you show me / teach me how to connect, wire up and what do I need to achieve to control leds with better brightness for this spot lights ( with this external power supply battery ) to arduino ?
I don't want to burn my original arduino mega 2560 r3 and I never tried such a thing before with arduino too; so I came here to ask your guidance.
36W at 12V is 3 Amps (36/12). If they are 36W each, that's 7 Amps total (if you believe any specs from random-unknown suppliers on eBay ).Obviously, you need a 12V battery. A 3 Amp-Hour (3000mAhr) would last about an hour with one light and about 1/2 hour with both lights. A 100 Amp-Hour car battery would last "all day".If you're using a power supply, you need a 12V power supply rated at 7 Amps or more.Depending on the design of the power supply built-into the lamps the lights may begin to dim as the battery discharges (and you may get less time than the calculated "amp hours") or they may remain bright slightly beyond the rated/calculated battery time. The brightness you get at 12V is as bright as it's going to get. If your battery (or power supply) can't put-out the full 3A or 7A, the voltage will "sag" and they might be dim. (And, you might burn-up your power supply.) Do you have a multimeter to measure the voltage from the battery with the lamps connected?You cannot connect the lamps directly to the Arduino. You can use a relay or a MOSFET driver circuit. A "regular" relay will need a driver, or you can get little relay boards with the driver already built-in.
Note ( as extra question ):For this spot light ( a different version ) " 2 x 125W Motorcycle Motorbike LED U5 Headlight Driving Fog Spot Lights ", what kind of battery do I need in volts and ampers ?