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  • Inexpensive garage lights from LED strips

    It depends on how many meters of the LED strips you want to run, it might be difficult finding an old PC power supply much over 350-450 watts. You can pick up a 12V 30 amp power supply from Aliexpress.com for around $30 US (including shipping). Higher amperage power supplies are also available. If you want to calculate the size of the power supply you need, divide the strip's watts/meter by its voltage (typically 12V). This will give you the amps/meter. Multiply this number by the total meters of LED strips you want to power to get the total amps required. It's a good idea to add a 20% safety margin to your total so you're not running your power supply full out all the time. In the author's case his strips were 30Watts/5meters=6W/m, Amps for one meter would be 6Watts/12Volts=0.5Amp/...see more »It depends on how many meters of the LED strips you want to run, it might be difficult finding an old PC power supply much over 350-450 watts. You can pick up a 12V 30 amp power supply from Aliexpress.com for around $30 US (including shipping). Higher amperage power supplies are also available. If you want to calculate the size of the power supply you need, divide the strip's watts/meter by its voltage (typically 12V). This will give you the amps/meter. Multiply this number by the total meters of LED strips you want to power to get the total amps required. It's a good idea to add a 20% safety margin to your total so you're not running your power supply full out all the time. In the author's case his strips were 30Watts/5meters=6W/m, Amps for one meter would be 6Watts/12Volts=0.5Amp/m so a 30Amp power supply could run about 48 meters of LED strips with a 20% "safety margin". 30A*80%=24A, 24A/0.5A=48m.

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