17 Dec
2003
17 Dec
'03
11:17 p.m.
On Tue, 15 Mar 1994, Perry E. Metzger wrote:
Make sure the drapes block IR. There are instances of even local police forces flooding the front of a house with IR light,
You mean heat? What did they do, exactly? Erect giant heat lamps in front of the house? No one inside noticed either?
IR does not mean heat. Infra-Red only implies having a wave frequency lower than that of "red" light. There are several bandwidths of IR used for nightscopes that cannot be felt as heat, nor do they increase the surface temperature of the target area to a noticable extent. -ck