so you have 380W to play with.
if ur runnin led blinkers you can forgo the 16w running light and blinker draw as its literally almost nill.
so you have tail lights @ 8w a piece, and head light at 55 or 65w + the coupla bulbs in the dash + the actual dash.... id be fair and say electrical draw from lighted pieces etc, are around 100watts w/ led blinkers.
that leaves 280 for spark / ecu.... not sure how much those use, but i cant see much being left over for accessories.
Now granted you can draw more than that 380w, but your gonna drain ur battery... so small bursts of greater than 380w total is no biggie.. but a constant draw of close to 380 and above is hurting for trouble.