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yes, I already have a bit of a voltage drop in the second string.

Rodney, thanks for the reference, you do everything BIG! Wow, a 30 amp LED string light supply! I read your post #117 and think I get it, but how long are your "strings"? BTW, thanks again for letting us run on your BIG WP layout last week, the gang and I had a great time, as attested by the attached photo. Running those loooong trains is an experience, sorry if we left any drool on the floor... Thanks, Otto

Otto,there is more than one way to figure out the current draw. When the string is illuminated measure the voltage across the SMD resistor pads. Do it close to where the power is fed (to get the value at maximum voltage). Then also give me the resistor's value as shown on the resistor (it will be 3 digits - something like "151" or similar number). That will allow us to calculatevthe current consumption for a set of 3 series-connected LEDs. I suspect I'll come up with about 20mA for each set of 3 (20mA going through the 3 LEDs). Once we know that, you can easily figure out the total current draw.

most strips are '15 watt' so just over 1 amp at 12 volts. So 2-3 more strings, easy.

I'm sorry but a long list of 'white LED strips' on Amazon show 18-24 watts for more common 2835 LED package, just over the 15W I posted for the older 5050 LEDs. These are Total watts, not per-foot.RGBW strips are 75-100 Watts total. But a quick search will get your own answers.I used an "LED Amplifier" (Amazon B0144NLSMW) between each RGBW string. This $13 box has a port for power for a 12V power supply (Different models have Barrel or barrier strips)