how important is the strain for yield

Hi all
I have just finished my fourth grow and the yield description was 300 -400 m2.well it really came in about 100m2 i no i have done everything else to a good stndard using a 600 w light with good soil filters ect .i hve been told to stay away from all yhese new strains and stick to old skool skunk for best results the strain was swiss cheese from nirvana. I have been told i should be reaching at least 500grams of dry bud from a good strain .Any input people.
Thanks

Strain is important for yield but really only as a limiting factor. You can't make a plant grow more then it's genetically designed but if other factors are not perfect then the yield can be less. Remember every plant grows differently and has different needs, what works for one may not work for another.

Also, those estimates that the seedbanks give you, are best case scenario. Meaning, sea of green, running 1000 watt HPS(or more), and everything done to perfection. 100-200 grams is what most guys can expect, unless they are growing at pro-level.