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General Astronomy >> Light Pollution

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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: It Never Hurts to try!! new [Re: csa/montana]
      #5763511 - 03/29/13 01:21 AM

also read of workers making a shield out of aluminum foil and sticking that inside the glass of the fixture.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: It Never Hurts to try!! new [Re: buddyjesus]
      #5763813 - 03/29/13 08:05 AM

GE makes a shield that fits INSIDE the glass and restricts the angle of the light similar to the suggestions posted. If you do a search on streetlight shield you find lots of options available.

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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: It Never Hurts to try!! new [Re: buddyjesus]
      #5763961 - 03/29/13 09:19 AM

I thought about that with the foil, makes sense I would think?

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richard7Moderator
Not Quite
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Reged: 11/02/07

Loc: Sacramento
Re: It Never Hurts to try!! new [Re: REC]
      #5765971 - 03/30/13 12:08 AM

I'm not sold on the foil idea. If something goes wrong then there will be one large flash and a few fire fighters arriving.

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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: It Never Hurts to try!! new [Re: richard7]
      #5765992 - 03/30/13 12:28 AM

I wouldn't be so worried about that happening. My other hobby is indoor gardening using bulbs much hotter than an LPS that have aluminum reflectors within two inches of the bulb without any problems(UL rated even). Some streetlamps even use plastic shielding around the bulb(often the glass on the bottom is plastic. LPS bulbs also have a high surface area making hot spots less likely. They are also the most efficient kind of bulb(at least before leds and magnetic induction technology) and that means less loss of electricity in the form of heat compared to even common household florescents. Also the wattage of streetlamps is usually 250 watts(not much) and sometimes 150w.

I welcome other opinions though.


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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: It Never Hurts to try!! new [Re: buddyjesus]
      #5765996 - 03/30/13 12:35 AM

oh yeah, btw, aluminum has a burning temperature of over 4000 Celcius. And that is elemental Al. In the real world, Al forms an oxidized coating that is even more resistant(alumina). The alumina is also the product of burning aluminum. Curiously enough, elemental aluminum is an ingredient in rocket fuel even though at normal temperatures Al is considered noncombustable(MSDS).

Now I have seen it burn, but generally that is when oil drips/spills off pans and this while under heat from a lit unsupervised burner will light up. So in other words, even though it is generally safe, not a good idea to line your trays under your burners with aluminum foil.


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richard7Moderator
Not Quite
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Reged: 11/02/07

Loc: Sacramento
Re: It Never Hurts to try!! new [Re: buddyjesus]
      #5767154 - 03/30/13 04:49 PM

I was thinking, kind of tongue in cheek, about somebody in a bucket truck tearing off a piece of al. foil and fashioning a shield, not realizing it was too close to the electrical contacts until the lights came on.

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buddyjesus
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Reged: 07/07/10

Loc: Davison, Michigan
Re: It Never Hurts to try!! [Re: richard7]
      #5767708 - 03/30/13 09:57 PM

gotcha

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