On Monday, 13 February 2017 03:10:10 UTC, Johnny B Good wrote:

One thing to consider, if adding a couple of 3 or 4 mm drain holes in
something like a PIR controlled 300 or 500 watt halogen security
floodlight, is the possibility of rainwater being rapidly sucked into the
enclosure when the lamp switches off causing a rapid drop in temperature
which generates a vacuum. The resulting spray could well impinge on the
still hot lamp's envelope causing it to crack or shatter from the ensuing
localised rapid cooling.

You're way overestimating things. There is no possibility of spraying.


NT