I have a basic understanding of leds and current but I always confuse myself when working out how much power something will use.
I am looking at creating a LED lighting unit for my aquarium.
I am looking at this Arduino Shield - Arduino 6 channel led shield 0,35-0,7-1A
So it can be configured to run at:
It can be bought on EBAY at this http://www.ebay.com/itm/Arduino-6-channel-led-shield-3-currents-can-be-set-0-35-0-7-1A-/370745850727?pt=LH_DefaultDomain_0&hash=item56522cbb67#ht_401wt_892
It requires external power.
I assume from this I can run all channels at 1amp - which would require 6 amps.
So I have been looking at power supplies as well on Ebay
I could buy an external power supply like 24v @10a @ 240w but I could also buy a power supply like 24v @5a @120w
So 5 amp may be able at a stretch run to 6 amp, but if I was only running 4 amp is there a negative to me buying the 10amp version?
Will it cost me more electricity to run? Or is it just capable of producing more power?
Also when talking about LEDs:
If I want to run 1 channel at 700ma and 1 led can consume 700ma does that means I can only run 1 led on this channel?
If I wanted to run 10 leds on a single 700ma channel does that mean each led although could consume 700ma each led will now will only get 70 ma?