i am in the market for new lighting and have decided on halides.

a few questions have emerged and i need a few pointers.

i have a 125gal tank and was thinking about 3 250watt bulbs. is this too much, too little?

cost is always a question. how can i go about this in a cost effective way?

if i run halides, do i have to run additional lighting? Actinics?

I'm not an electritian so if retros are the wayto go where can i get a how to drawing so i dont burn my house down?

any help is appretiated
thanks