I am involved in some work on the above, as it is, I understand, becoming common for some specifiers to require flashing beacons in bedrooms (as called for by AD M), OF SUFFICIENT OUTPUT TO WAKE SLEEPING PEOPLE WHO ARE DEAF. (The words in caps are the contentious and tricky bit.) Last time I researched data on this, the only thing I could find that was definitive was American work, which suggested that tremendously high light outputs would be necessary (involving high current demands and engineering difficulties potentially). I also have a recollection that the Americans now regard this as an unreliable means for waking deaf people anyway. I do not think that AD M is clear in its intentions in any case, as it is ambiguous as to whether the beacons are for deaf people who are awake, or whether the intent is to wake them up if asleep. ( I have always thought the former.) Does anyone know of other, or more recent, research on the subject of the level of illuminance required to wake deaf people from sleep, or on the use of this technique.
