# Strobe Lights and Construction **URL:** \ **Category:** Factual Questions\ **Created:** [September 14, 2001, 3:18am UTC](https://boards.straightdope.com/t/strobe-lights-and-construction/81529 "2001-09-14T03:18:12Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![smokinggun](https://avatars.discourse-cdn.com/v4/letter/s/278dde/32.png) [@smokinggun](https://boards.straightdope.com/u/smokinggun)\ **Post date:** [September 14, 2001, 3:18am UTC](https://boards.straightdope.com/t/strobe-lights-and-construction/81529/1 "2001-09-14T03:18:12Z")
Ever seen those strobe lights in rooms on newly built or renovated buidlings? Flashing away, maybe in only one or two rooms at time? What are these lights for? They don’t seem like emergency lights being tested, but maybe they are. Thanks - john ---
**Author:** ![evilhanz](https://avatars.discourse-cdn.com/v4/letter/e/ba8739/32.png) [@evilhanz](https://boards.straightdope.com/u/evilhanz)\ **Post date:** [September 14, 2001, 4:13am UTC](https://boards.straightdope.com/t/strobe-lights-and-construction/81529/2 "2001-09-14T04:13:04Z")
Are you sure you’re not seeing the blue-white arcs of interior welding? ---
**Author:** ![smokinggun](https://avatars.discourse-cdn.com/v4/letter/s/278dde/32.png) [@smokinggun](https://boards.straightdope.com/u/smokinggun)\ **Post date:** [September 17, 2001, 12:03am UTC](https://boards.straightdope.com/t/strobe-lights-and-construction/81529/3 "2001-09-17T00:03:39Z")
no this is not welding, no one is even in the rooms. ---
**Author:** ![Johnny\_L.A](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/johnny_l.a/32/1084_2.png) [@Johnny\_L.A](https://boards.straightdope.com/u/Johnny_L.A)\ **Post date:** [September 17, 2001, 12:07am UTC](https://boards.straightdope.com/t/strobe-lights-and-construction/81529/4 "2001-09-17T00:07:09Z")
If they are on top of the structure, they are there to warn aircraft that there is a building there.