Congrats....Butitsnot 1000 watts...... its 100..if you have the SP- 1000
But those 100 watts replace aHID of 1000 Watt... , Thats how the Name comes together....
The recommended Light for a4x2 is the SP-2000,
I have the spiderfarmer SP-2000 in a 2x4 Tent ( 60 cmx120 cm and 2m hight) and i let the Light run on 100 Percent, The distance for my seedlings ( first 2 weeksis 90 cm...... And if they are bigger 75 cm. From then on i dontcahnge distance of the lights
The SP-1000 is recommended up to 1 squaremeter coverage....... I just would look how they perform and looking to get another light for flower. For vegetation start on 75 cm ...... and let them like this... in flower look for another Light, ofr look how theyperform... very possible its enough
Because those qunatumboard have ahigh quality DL I -Output
Just pay attention with your seedlings, give them enough distance to the light