HP sodium Lighting [RE-wrenches]

[Ray Walters]

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Travis was the one with all the great info; I was the duffer asking the 
questions. Based on the info garnered from this list,  I've actually 
decided to create an on-campus lighting experiment at UNM Taos. Since 
the lighting bollards I have speced just take a medium Edison base, I'm 
going to power 2 units with bi pin 20 watt halogen bulbs, 1 with an 
(Eeekk) 12 volt 11 watt compact fluoresecent, and the fourth with a 96 
bulb LED. Right now , I can't find a 12 volt version, any help with 
finding the  highest output  LED  (12 volt, medium Ed base) would be great.

Ray

>Ray,
>Any idea what the Color Rendering Index is for LED lights?  I imagine that
>it is pretty low.  Any information on the long term ramifications of LED
>lighting on eyesight?
>Thanks for the great rundown on HPS and LPS lighting.
>
>Rob Harlan
>Rob Harlan Electric
>
>----- Original Message ----- 
>From: "Travis Creswell, Ozark Solar" <ozsolar at ipa.net>
>To: <RE-wrenches at topica.com>
>Sent: Thursday, February 02, 2006 2:35 AM
>Subject: RE: HP sodium Lighting [RE-wrenches]
>
>
>  
>
>>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
>>
>>
>>
>>
>>
>>
>>
>>-----Original Message-----
>>From: Ray Walters [mailto:walters at taosnet.com]
>>Sent: Wednesday, February 01, 2006 3:27 PM
>>To: RE-wrenches at topica.com
>>Subject: HP sodium Lighting [RE-wrenches]
>>
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>>
>>Hi Wrenches;
>>
>>I'm doing a small lighting project for the University of New Mexico. It
>>will be a demonstration for future students, as well as a hands-on
>>installation for my current class. We are proposing using Bollard type (
>>3 ft pedestal lights for along sidewalks, etc.). The only reasonably
>>priced units are AC, and are High pressure Sodium. HPS lighting is as
>>efficient or more so than fluorescents, but I'm concerned about  the
>>inverter for HPS lighting. MY questions:
>>1) Do HP sodium light ballasts require pure sine wave?
>>2) How much surge capacity do their ballasts require to start (35 watt
>>light), worst case scenario, ie.  very cold, very hot, etc.
>>3) Anybody have a good source for DC bollards maybe?
>>
>>We found a site that had DC LED Bollards (wow!) but alas it was european
>>and not available here.
>>
>>Thanks for sharing your wealth of knowledge,
>>
>>Ray Walters
>>
>>
>>
>>
>>
>>
>>
>>    
>>
>
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