On Sun, 12 Feb 2017 22:46:50 -0800, tabbypurr wrote:

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.

Shhh... Don't let "Murphy" hear you say things like that. :-)

--
Johnny B Good