Bh1750 lux sensor question

Its something that look like this :

when the laser point directly at the sensor, the reading value is=o (too many lux sensor overlimit?) what i can do is point it a little offset so the reading is something like 55000
I will need in order, when the laser beam is cut by a object to
-turn the laser off (laser is connected to a 5v pin in arduino)
-trigger the flash (set a digital pin to high, then low, flash is connected to a optoisolator)
-trigger the camera shutter (set a digital pin to high, the low, shutter is connected to a optoisolator)
-then wait couple of milliseconds
-then turn the laser on again
-wait couple of millisecond
then the whole process can loop again, until memory card is full......

that make sense?