It allows you to control lights, pumps, temp., pH, wavemaker, etc. As a lighting controller they seem to be ok, though have been reported to be buggy at times. I've heard nothing but good things from Apex other than the high price tag.
That is from Digital Aquatics not neptune. I am about to order one too.
The better deal is bulkreefsupply.com It is the same package with an additional PC4 for 269.99 (free shipping).
It will only use 4 modules but unlike what most of the vendor sites say it will accept ANY module.
With the BRS setup you already have 3 modules. The 4th can be:
MLC - Moon Light Controler
ALC - Advanced Light Controler
SL2 - Ph, salinity, temp.
PC4 - 4 additional outlets
Just make sure it has enough expandability to do all you want. It is perfect for me:
First - PC4
Outlet 1 - Finnex 500W Heater
Outlet 2 - ATO Pump
Outlet 3 - Lights
Outlet 4 - Lights
Second PC4
Outlet 5 - Cooling fans
Outlet 6 - Carbon Reactor/GFO Reactor (2 Units 1 pump)
Outlet 7 - Return Pump
Outlet 8 - Skimmer
I am going to need another PC4 when I automate 2 part dosing but that will be all the expansion I can do. My moonlights have there own controler, my Vortech's have there own controler and the AI controler is excelent so you won't need an ALC for these.
Don't forget you switches and adaptors if you plan on ATO
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