My prefix adds a lot of grain
My infix emits a powerful shine
If you'd come destroy my base
I wouldn't be on time
Finishing what MacGyver88 started, you are
ISOLATE
My prefix adds a lot of grain
ISO - the larger an images' ISO rating is, the grainier it is
My infix emits a powerful shine
SOL - the sun, just as MacGyver88 suggested
If you'd come destroy my base
I wouldn't be on time
LATE - not on time, again as MacGyver88 suggested
Title
ISOLATE - "an individual socially withdrawn or removed from society", according to Merriam-Webster
You could be
DESOLATE
My prefix adds a lot of grain
DES - maybe an acronym for something dealing with grains (food, grainy picture, small things ???)
My infix emits a powerful shine
SOL - the sun
If you'd come destroy my base
BY REMOVING THE FIRST TWO PARTS, or desolate - synonym of destroy
I wouldn't be on time
LATE - not on time
Title
DESOLATE - could refer to a lonely, out of the way place.
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$\begingroup$ You're so nearly there, you picked up more hints than I meant though ;). Only the prefix isn't as I meant. $\endgroup$ – SoftwAir Feb 11 '20 at 7:07
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$\begingroup$ @SoftwAir, It was a toss-up between the two. I went with my gut. I read a little too deep into it. No worries. :) $\endgroup$ – MacGyver88 Feb 11 '20 at 13:41