[TheForge] Shop Lighting

Tue Feb 28 09:20:04 EST 2006

Both the T5 & T8 lamps work in the same applications as the T12 we are all used to.  The T5HO are "high output" and intended for high bay applications to compete with metal halide and HPS.

T5's are slightly more efficient than T8's and T12's. T5HO's give out double the lumens per lamp which allow for less fixtures.

Walt

From: "Dick Nietfeld" <blksmth at charter.net>
Date: Mon Feb 27, 11:27 PM
To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
Subject: RE: [TheForge] Shop Lighting

Rick, it sounds like from your description that the T8 lamps would work on a
12 ft. ceiling, but not on a 10 ft. ceiling.

Thanks,

Dick

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Rick Korinek
Sent: Monday, February 27, 2006 9:25 PM
To: 'Sponsored by ABANA'
Subject: RE: [TheForge] Shop Lighting

Walt, This is great report.  As for the shop lighting application in
question, a T8 fluorescent system with electronic ballasts will perform well
given the fixture mounting heights at 12-13 feet.  The main question is the
temperature of the shop.  If it is allowed to go below 50 degrees F, T8
fluorescent are not a good choice. (F96T12 High Output lamps with cold
weather ballasts may be the ticket there).

A couple of points:

Temperature.  The T8 fluor. Lamps like to see at least 50 degrees ambient
for good starting.  One can use an enclosed fixture (lensed) to run in
slightly colder temps, but they are not for a really cold shop or outdoors.

Color (color temperature and rendition).  Cool white has a color temp of
4100 deg. K.  Most people like a little warmer tone.  3500 deg K lamps are
nearly between the color of incandescent and cool whites.  The T8 lamps have
better phosphors which provide more lumens per watt but more importantly,
better color rendition.  There are 2 levels commonly available (leaving the
Vita and other "full spectrum" lamps alone) The lamps with a "color
rendering index" (CRI) of 70 cost about $2-3 per lamp.  Those with a CRI in
the 80's are more like $5 per lamp.  The benefit of the more expensive lamps
is that they put out more light for the same wattage and objects of color
look better.  (CRI is given in a scale from 1 to 100.  Cool white is only
about 62,incandescent is 99+).

You will be able to buy the lamps with CRI of 70 at Home Depot etc.  They
will be a F32T8 SP35 or SP41.  The lamps with 80 CRI are available from a
commercial lamp distributor.

Flicker.  The electronic ballasts drive the lamp at least 20,000 Hz.,
usually 30k.  This all but eliminates flicker, reduces audio hum and
increased light output.  The lamps with CRIs above 80 have a thicker layer
of phosphors which further help to even out the light output as the lamp is
driven by the alternating current, whether it be 60 or 30K Hz.

For what it's worth.....
-Rick

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of wmullett at bright.net
Sent: Monday, February 27, 2006 3:29 PM
To: Sponsored by ABANA
Subject: Re: [TheForge] Shop Lighting

We are close to having LED's available for this.  When that happens, we all
will be wanting to retrofit to those.  I've been looking at architectural
exterior lighting with LED arrays.  Super SUPER long life and very low power
consumption.  The trouble has been getting white light.  

For now, look at using T5 flourescent fixtures.  Check out this address for
analysis.

www.smud.org/education/cat/cat_pdf/T5.pdf

Walt

From: "Woolley" <wjec at verizon.net>
Date: Mon Feb 27, 12:49 PM
To: <theforge at mailman.qth.net>
Subject: [TheForge] Shop Lighting

Greetings,

I'm choosing lighting for my shop.  It is a blank slate at this point.  The
ceiling height is approx. 13 feet.  The walls and ceiling are painted white.
Does anyone know any reference for selecting  various forms of light
fixtures.  I'm fishing for ideas before I talk to anyone in the position to
sell me something.  The quality of light (how accurately it renders colors
etc.) and price to buy and run are my concerns. Any help appreciated.

Regards,
Bill Woolley
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