I have a 10 metre set of 12VDC "5050" LED lights (RGB). The manufacturer/distributor (from eBay) quote these LEDs as being 10.8W per metre (108 W for 10 metres). But they also quote (on their eBay advert) 1.2A for 5 metres (2.4A for 10 metres).
I currently have a 6A power supply driving these lights without any problems.
I'm confused because I thought Power = Current x Voltage - so the current should be 9A (not 2.4A?).
I'm guessing that the LEDs draw a lot less than advertised anyway as I have them on 'fade effect' so they just fade between solid colours (i.e. at most two of the RGB LEDs on at one time).
I want to connect another 5 metre set of lights to my installation. I've read that, due to current consumption, it's best to connect these in parallel.
However, I'm not sure how to calculate the power/current consumption in order to work out whether I will need to upgrade my PSU?
Also, I'm worried that due to the different resistances of the two strips (one 5 mtrs and one 10 mtrs), one will be significantly brighter than the other or it will cause other problems?
Could you shed any light :) on this please?