I have got to choose a HPS light but I am at a cross-road and not sure which way to go. First off...my grow space is 4ft (w) x 2.5ft (d) x 6ft (h). I can't decide if I would be better off with a 600 Watt HPS with a digital ballast (95,000 lumens) or a 1000 Watt HPS standard (non-digital)...