DMX dimmer/switches

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Hi, I'm currently learning how to use DMX and wondered if anyone could point out the advantages/disadvantages of these two types of dimmers? I'd like to potentially control devices over the internet, and I was considering triggering things such as lights or solenoids with dimmers. Basically I'm just wondering which I should buy.
http://store.arduino.cc/eu/index.php?main_page=product_info&cPath=11_12&products_id=24

http://prolight.co.uk/item/bote27/?PHPSESSID=c0a17f2e2e78aff25ef66ca835583a81

I'll be using this with the Super DMX shield.

2

It depends if you need to control mains-level lighting or just LEDs. I imagine the mains version is more expensive... The low voltage one does 9 to 24V at upto 2.5A/channel (60W/chan at 24V) but doesn't include a power supply...

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