# LED strip power requirement [closed]

I have an approximately 1 meter LED strip in "warm white" running from a 2 amp power supply for some time now with no problems. I want to add another strip, of about 2 meters, to this same power supply. This second strip will have a switch on it, so sometimes the power supply will power 3 m of LEDs, sometimes just 1 m.

Should I up the amperage? Is it better for the amperage to on the high side or on the low side?

## closed as unclear what you're asking by Passerby, Wesley Lee, DoxyLover, pipe, RoyCNov 4 '18 at 14:55

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• Possible duplicate of Choosing power supply, how to get the voltage and current ratings? – Passerby Nov 3 '18 at 20:31
• Your power supply's current capacity should exceed your current draw. Often by 10 to 20 percent more. So if you need 4 amps a 5 amp supply us better. For your specific need , you need to know how much current each meter takes. – Passerby Nov 3 '18 at 20:33
• what do you mean by high side and low side ? – jsotola Nov 3 '18 at 22:09
• Sorry #jsotola I meant is it better to have more amps than needed or less? Since posting from other comments and links provided I understand it's more. – MReinhart Nov 5 '18 at 18:48