Jupiter is 88,736 miles in diameter and the moon is 2,160 miles in diameter, so the area difference is 1,688. The albedo of the moon is 0.12 and Jupiter is 0.52, so the nighttime full moon brightness would go up by 7,313. Bright moonlight is about 0.25 Lux (0.2 to 0.3), so with Jupiter we could have 1,800 Lux. Office lighting is usually 300 to 500 Lux and a TV studio is about 1,000 Lux, as is an overcast day. So it would be very bright indeed.