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[OL-Forum] Digest Number 1024
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There are 2 messages in this issue.
Topics in this digest:
1. Re: Is this a FCO glare bomb?
From: George Nickas <nickas@hanover...>
2. Re: Is this a FCO glare bomb?
From: George Nickas <nickas@hanover...>
________________________________________________________________________
________________________________________________________________________
Message: 1
Date: Wed, 18 Feb 2004 10:35:26 -0500
From: George Nickas <nickas@hanover...>
Subject: Re: Is this a FCO glare bomb?
Absolutely right This is no FCO. IES definition says no light above 90
degrees. Without the drop lens it appears to be FCO but the drop lens
is part of the luminaire, so you can't have your cake and eat it. This
is an attempt to re-define FCO using an old trick. If you cannot comply
say that you are but by your own new definition. The pathetic thing is
that at four to five times the mounting height in the horizontal
direction, the illumination provided by scatter from the drop lens is
insignificant. The only reason for the drop lens appears to be so you
can see the luminaire--not for illumination! I think there is still a
strong unwritten motivator in this kind of design that the luminaire has
to be seen to be 'real'. All cosmetics. gn
On Tuesday, February 17, 2004, at 10:28 PM, Richard Klappal wrote:
> If it has a drop-lens, it is NOT a FULL-CUTOFF fixture, and as patric
> states, when the light level is sufficiently excessive (!?!?) no amount
> of
> cutoff will be effective.
>
>
> The eye can only accept a 100:1 luminance range at a given level of
> adaptation. If you create a hot-spot, everything outside that hot-spot
> is
> in an impenetrable puddle of darkness.
>
> -----Original Message-----
> From: patric@ghostriders... [mailto:patric@ghostriders...]
> Sent: Tuesday, 17 February 2004 19:30
> To: OutdoorLighting-Forum@yahoogroups...
> Subject: Re: [OL-Forum] Is this a FCO glare bomb?
>
>
> Roger L. Hammer wrote:
>
>> They make a version w/out the drop lens which looks great but the
>> spread
> is
>> worse they claim thus requiring more fixtures. I tell you what though,
> they
>> have selected the 1000 W fixtures and these things are bright.
>
>
> With each light standard sporting 1000 watts of HID, of course it would
> be "worse" as they are creating pools of intense light surrounded by
> intense darkness (or at least, the illusion). The overkill effectively
> cripples the eye's ability to adapt to the surroundings, and creates an
> apparent need to add more fixtures later on (job security for someone?).
>
> How old are the standards they claim to be in compliance with, and do
> they seem to be stuck on seeing 'how few fixtures they can make cover
> the largest area, and if glare's a problem well just compensate with
> more light' mindset?
>
>
>
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________________________________________________________________________
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Message: 2
Date: Wed, 18 Feb 2004 10:40:31 -0500
From: George Nickas <nickas@hanover...>
Subject: Re: Is this a FCO glare bomb?
Tell them to mount at least one of the luminaires without the drop
lens. Measure illumination with and without.
My guess is that extra luminance with the drop lens is awful with little
to no illumination gained in any direction. Then ask why the drop lens?
gn
On Tuesday, February 17, 2004, at 05:34 PM, Roger L. Hammer wrote:
> I am on our university's outdoor lighting committee. They have adopted a
> standard of this light fixture by Wide Lite. We have already
> installed a
> bunch of them around campus and I don't like them at all. Although
> they are
> FCO the drop lens reflects light something fierce and these things are
> glarey to my eye, yet the university lighting guys say, "hey, they're
> FCO
> like you wanted so shut up." Please look at the accompanying brochure
> and
> tell me what you think.
> http://www.wide-lite.com/Literature/SL-cover.jpg
> They make a version w/out the drop lens which looks great but the
> spread is
> worse they claim thus requiring more fixtures. I tell you what though,
> they
> have selected the 1000 W fixtures and these things are bright. The
> parking
> lots are between 0.8 and 3.6 foot candles and are much brighter than the
> roadway and neighborhood ambient levels. They claim to be in compliance
> with IESNA standards, but Mt. Pleasant is a community of only 30,000
> where
> rural characteristic preservation is important. We meet tomorrow to
> discuss
> adopting these lights campus wide. Roger
>
>
>
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