HP sodium Lighting [RE-wrenches]

[Rob Harlan]

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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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