HP sodium Lighting [RE-wrenches]

[Ray Walters]

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Ahh Travis;

One of theses days if  we ever meet, I'm going to need to buy you a brew 
or three. And that goes for all of you mangy dog solar wrench  types.
I owe this whole list a beverage (could be a good coffee, tea ,etc. if 
you prefer)
Always appreciate your very informed comments, this list has saved me 
from countless booboos. I guess thats why we do it, right folks?

Keep saving the planet,

Ray

PS on the light issue, I've specified a standard fixture with 
incandescent bulb... we pull the bulb, put in a hot LED model and wire 
the thing for 12 volt. Cheaper, simpler, and no one gets hurt.


Travis Creswell, Ozark Solar wrote:

>Hi Ray,
>
>If you could, I'd avoid HPS and especially avoid LPS.  Yes, it does have the
>highest lumens per watt (LPW) but LPW does not completely reflect what our
>eyes see.
>
>Color Rendering Index and Kelvin are also very important.  A CRI of 100 is
>perfect. IE; 100 out of 100 people will say they like it, halogen is the
>typical benchmark.  And it turns out that we feel the brightest light is
>somewhere around 5000 Kelvin.  HPS is approximately 2800 Kelvin with a CRI
>of less then 40.  IE less then 40 will approve of it.  The classic "cool
>white" fluorescent lamp is 4100 Kelvin and ~60 CRI and warm white is 3000k
>and ~60 CRI.
>
>When you get into the tri-phosphor fluorescent the CRI approaches 90.
>
>So what I am trying to say is people will actually think a 35 watt
>fluorescent is brighter then a 35 w HPS and that's what matters.  I've done
>hundreds of side by side comparisons for customers and every time they
>choose the fluorescent. A foot candle meter will say the opposite but it's
>not signing the checks, the customer is, so guess which one I pay more
>attention to.
>
>In case you haven't figured out we do a ton of commercial and industrial
>lighting design and installation. (non-solar stuff)
>
>
>I don't know about requiring pure sine wave.
>
>The HID (high intensity discharge, HPS, MH, MV, ETC) ballasts I've measured
>have no start up surge.  As the light warms up the current climbs to it's
>rated running current.
>
>The HPS lamps in that size range are likely more expensive to replace than
>fluorescent.
>
>Best,
>
>Travis Creswell
>Ozark Energy Services
>
>
>
>
>
>
>  
>

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