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HID street lights ?'s #42296
09/18/04 01:31 PM
09/18/04 01:31 PM
E
e57  Offline OP
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
So someone asked me this the other day.

Why would an HID street light, (with a bad ballast) only kick on as someone walks near it?

I thought about it, and realized I had noticed it too, but paid little attention to it. (As I remember a few like this in my youth, long before I entered the trade.) I think about it now, and have no real answer for it. Anyone have any therories for this?


Mark Heller
"Well - I oughta....." -Jackie Gleason
Work Gear for Electricians and the Trades
Re: HID street lights ?'s #42297
09/18/04 04:08 PM
09/18/04 04:08 PM
N
NJ Wireman  Offline
Member
Joined: Aug 2004
Posts: 186
New Jersey (South Jersey)
Maybe your shadow made the photo cell think it was night:-} Sorry couldn't resist i have not a clue

Re: HID street lights ?'s #42298
09/18/04 05:03 PM
09/18/04 05:03 PM
S
Sandro  Offline
Member
Joined: Dec 2001
Posts: 444
Stoney Creek, ON, Canada
NJwireman... No no...the motion sensor picked up the person and activated the light... LOLOL.

Re: HID street lights ?'s #42299
09/18/04 07:16 PM
09/18/04 07:16 PM
R
RobbieD  Offline
Member
Joined: Feb 2003
Posts: 231
Canada
Maybe the ballast isn't bad and its the bulb. When the bulb starts to die it heats up and after a while it stops, cools down, and then relights. It might just seem like it only happens when the person is walking by. I bet that if they sat there a while they would see it go out and then relight.
Just a thought.

Re: HID street lights ?'s #42300
09/19/04 09:22 AM
09/19/04 09:22 AM
E
e57  Offline OP
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Dare I say it, and the only reason I brought it up, is that.... When I was about 17 or so, for about a year, so freinds and I hung out on a street corner. At the end of the block was a street light that lit ONLY when you walked under it! No photo cell, no motion detector. But we were always in view of it, and knew that it would only light when someone was near it. So it's not a "If a tree falls in the woods...." thing. As if by walking by changed some element of potential allow the light to kick on.


Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: HID street lights ?'s #42301
09/20/04 04:08 PM
09/20/04 04:08 PM
R
roundeler  Offline
Junior Member
Joined: Sep 2004
Posts: 3
Minneapolis, MN
A few thought provoking points...

When I tree falls in a forest and no one is around to see it, did it fall?... so, does this still happen regardless if anyone is around or not?

The body puts out 100 watts on average, could that effect the photo cell?

What sort of E & M does the body put out? heh

OK, i have too much time on my hands at the moment.


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