The BENQ X1300i has a rated brightness of 3,000 lumens. I took 3-4 readings about 15-20% out from the center of the lens, which usually gives a pretty good approximation of ANSI lumens. At full wide-angle, I measured the X1300i in its brightest picture mode, BRIGHT, with the lamp power set to NORMAL.
BENQ X1300i Brightness:
At wide zoom, Normal Lamp, Bright mode, the X1300i measured 3393 lumens which was slightly higher than BenQ published number of 3000.
For the seven available modes, I also measured them at wide-zoom, since this is the brightest possible result for the projector as well as the way the manufacturer likely measured it. In addition, I took a tele-zoom measurement in the X1300i’s brightest mode (bright) to give you an idea of the amount of light lost by zooming in the lens.
Brightness at wide-zoom = 3393 ANSI Lumens
Brightness at tele-zoom = 2507 ANSI Lumens
As you can see the tele measurement comes out at a 26.11% lumens sacrifice.