If one has say an 800 lumen bulb, how many lux are necessary in order for a human to detect when it's suddenly turned on in a room with brightness levels of
- 30 Lux
- 50 Lux
- 100 Lux
1.-How many Lux are necessary to catch a human's attention when when looking in the general direction of the bulb?
2.-How many Lux would almost guarantee to catch a human's attention?
Basically, I wish to know the visual detection threshold, but even rough approximates would be helpful. I'm building an attention guidance system and would like to know how bright a light source would have to be in order for a user to detect it (threshold where he might detect it, and where he most likely will).