The term used by fans of astronomy is "Full Cut Off Lights". There is
a big drive to eliminate vertical light pollution.
Here are links to related information:
http://www.darksky.org/index.php?option=com_content&view=article&id=452
http://www.uwex.edu/energy/lighting_OL.html
Doug Armstrong
On Tuesday 15/11/2011 at 2:41 pm, Doug Braun wrote:
> I was under the impression that mercury vapor lights are pretty
> efficient- as good as any other type of fluorescent light. But those
> things (sometimes called "yardblasters") tend to send too much light
> all over the place, including upwards. You might be better off with
> some type of lighting fixture that has less total brightness, but has
> a better type of reflector that sends the night to where it is
> actually useful (e.g. not the neighbor's bedroom windows).
>
> Doug
>
> On Tue, Nov 15, 2011 at 10:43 AM, <eric@megageek.com> wrote:
>
>>
>>
>> Is there a better (more efficient) option for lighting a fairly large
>> area
>> at night? Maybe one that comes on only with motion? Or is a MV light
>> pretty cheap to run and I should just go with that?
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