I can't imagine an IRB-approved research study that requires a software solution (developed under an NDA) to a hardware problem that couldn't be solved with a one-inch square of black electrical tape.
For the price of a contracted software developer, you could simply buy a model of laptop (or smart phone), in which the bezel can be pried open without substantial damage, and behind the LED's transparent aperture (but obscuring the LED), you fix a tidbit of black tape or whichever opaque material you may prefer.
Or, better yet, for pretty much every situation that doesn't involve eye-movement tracking, simply install a hidden security camera at an opportunistic vantage point.
An IRB would only care about whether the deception perpetrated on the subject is justifiable. They wouldn't care one iota how the light was disabled--the risk to the subject is the same regardless of whether the light is disabled by hardware or software or not used. For example a BYOD type study might be plausible because in some circumstances subjects may be more comfortable/candid using their own devices. Who knows.
The issues for the IRB would only be the fact that the subjects are not consented to covert surveillance and whether the nature of the information collected presents a risk to the subject if accidentally disclosed.
I can't imagine an IRB-approved research study that requires a software solution (developed under an NDA) to a hardware problem that couldn't be solved with a one-inch square of black electrical tape.
For the price of a contracted software developer, you could simply buy a model of laptop (or smart phone), in which the bezel can be pried open without substantial damage, and behind the LED's transparent aperture (but obscuring the LED), you fix a tidbit of black tape or whichever opaque material you may prefer.
Or, better yet, for pretty much every situation that doesn't involve eye-movement tracking, simply install a hidden security camera at an opportunistic vantage point.