[SML] White LED lighting

Richard Niederberg ladesigners at gmail.com
Tue Jun 21 19:12:50 UTC 2016


Dear Ray,
The 'WARMER' monochromatic arc-bulbs are Sodium; the 'COOLER' monochromatic
arc-bulbs are Mercury. I used both kinds on the same job a while ago,
McCandless-style, to light a Theatre's Parking lot. The Audience didn't
know what hit them, but enjoyed the result while walking to and from their
cars. The motivating light was a 'neon' fringed marquee (warm) with
fluorescent tube-backed changeable letters (cool).
/s/ Richard
_________

On Tue, Jun 21, 2016 at 11:50 AM, Ray Gibson via Stagecraft <
stagecraft at theatrical.net> wrote:

> On Tue, Jun 21, 2016 at 10:52 AM, Jerry Durand via Stagecraft <
> stagecraft at theatrical.net> wrote:
>
>> The new "white" LED street lighting which is rapidly being retrofitted in
>> cities throughout the country has two problems, according to the AMA. The
>> first is discomfort and glare. Because LED light is so concentrated and has
>> high blue content, it can cause severe glare, resulting in pupillary
>> constriction in the eyes. Blue light scatters more in the human eye than
>> the longer wavelengths of yellow and red, and sufficient levels can damage
>> the retina
>> <http://www.sciencedirect.com/science/article/pii/S001448351400236X>.
>> This can cause problems seeing clearly for safe driving or walking at night.
>>
>> I've always enjoyed the soft pink glow of the old streetlamps in the LA
> suburbs, which probably match what was around everywhere else.  Are those
> sodium lamps?
>
> I also remember that the streetlights in San Diego were an ugly orange
> color and they really bothered me.. What kind of lamps were those?  I
> haven't been that way in a long time so maybe they're long gone but if I
> noticed this difference surely more experienced lighting professionals here
> would?
>
> Ray
>
>
> ____________________________________________________________
> For list information see <http://stagecraft.theprices.net/>
> Stagecraft mailing list
> Stagecraft at theatrical.net
> http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net
>



-- 
/s/ Richard
_________
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://theatrical.net/pipermail/stagecraft_theatrical.net/attachments/20160621/2b32261c/attachment.html>


More information about the Stagecraft mailing list