Though the subject specifies those two grenade types, this really to all grenades without a blast distance listed (such as virus, hallucinogen, and smoke grenades). I know the answer may be very different for each individual grenade, and it's only the two listed in the subject line that I Really care about.
What is the radius of the effect of the grenade? For the blind grenade, how large is the radius of the cloud released? Also, for how long does it persist? Furthermore, I know it blocks line of sight, and makes ranged attacks impossible for targets in or behind the cloud (or at least, I assume it does). Would you still be able to make melee attacks within the cloud? If so, would they follow the normal rules for fighting blinded (-30 to the test), or would the cloud not significantly impair visibility to adjacent targets (ie how thick is the stuff)?
For the photon flash grenade, how far away would a character have to be (with and without protection) to not suffer the effects of the grenade? Also, the cybernetic senses list that the good quality ones give you "+20 on tests made to resist attacks on the sense itself- such as a blinding flash or a deafening bang". Is that how the grenade works, people have to make a test? If so, what kind of test and at what difficulty level? Would the difficulty be related to the proximity to it?
Basically I'm asking how these grenades work, as I'm not finding the details of the mechanics behind these grenades anywhere in the core rulebook or the errata. If it's somewhere obvious and I'm just missing it, please point me in the right direction. Otherwise, if you know of any official mechanics at all for these suckers, please help. It's greatly appreciated.