120 Sq feet is a lot to light but, if ya got it why not?
Damn i did the math and it costs about 800bucks to light 120 sq ft with hps using 5 1ks off amazon
Usings 5 fcE 6500s directly from mars costs about2500 bucks using only 3650 watts
so 1400w less with the leds per hr
with a run of 30day veg and70of flower
You save about 2000kw using leds over the couse of 100 days
Sothe savings only ad up when you start using them consistently run after run
The hps need bulb changesover use that wattage but can be aircooled
The leds run cooler but too many of them would need a dedicated ac to run while on
Iguess it really depends on your environment and electrical cost to see wich one is really cheaper..