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#17573 - 11/29/02 02:52 PM help with lighting demand!!!
Mike_Riverside Offline
Member

Registered: 08/18/02
Posts: 34
can someone please check this math...
http://www.nettektsp.com/visio/turoci%20office%2014_files/turoci%20office%2014_frames.htm

i believe the only 3 fixtures would be required, right?

should i use 3 or 4?

will this drawing provide adequit light for the office?

any suggestions?


thanks

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#17574 - 11/29/02 03:04 PM Re: help with lighting demand!!!
JuddsAirco Offline
Member

Registered: 10/12/02
Posts: 50
Loc: KY, USA
If this is a drop ceiling I would probably go with 4 three bulb T-8 troffers. These are more efficent than the old T-12 bulbs while providing the same amount of light. There is also a T-8 troffer on the market where one bulb will light when the power is down as an alternative to the wall pack emergency lights.

[This message has been edited by JuddsAirco (edited 11-29-2002).]
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#17575 - 11/29/02 03:30 PM Re: help with lighting demand!!!
Mike_Riverside Offline
Member

Registered: 08/18/02
Posts: 34
thanks for the help, these fixtures are lithoania 4 bulb t-8 troffers.

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#17576 - 11/29/02 03:48 PM Re: help with lighting demand!!!
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Where are you getting the 3VA/SQ FT. from?

Curt
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Curt Swartz

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#17577 - 11/29/02 04:26 PM Re: help with lighting demand!!!
Mike_Riverside Offline
Member

Registered: 08/18/02
Posts: 34
2002 Ugly's

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#17578 - 11/29/02 05:02 PM Re: help with lighting demand!!!
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
The NEC requires a minimum of 3.5VA/SQ.FT. for lighting load calculations but this has nothing to do with the number of fixtures required to illuminate an office space. The manufacture of the fixture or lighting designer can tell you how many fixtures will be needed to provide the desired lighting level. In California you are only allowed a maximum of 1.6 watts/SQ.FT. for office space so you would only be permitted to use two 4-lamp fixtures.

Curt
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#17579 - 11/29/02 10:44 PM Re: help with lighting demand!!!
joeh20 Offline
Member

Registered: 03/21/02
Posts: 95
Loc: Tullahoma, TN, 37388
VA's are for load calculations. Foot candles is how you measure the amount of lighting you provide or require. The NEC will address your lighting load for your service calculations, but doesn't dictate a specific amount of lighting for a particular space. Each type of occupancy differs somewhat. The requirements from the California code of 1.6 watts seems adequate for most offices.
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#17580 - 11/30/02 10:51 AM Re: help with lighting demand!!!
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
I'd use the 1.6 watts per square foot method.

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#17581 - 12/01/02 06:04 PM Re: help with lighting demand!!!
Scott35 Offline

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Registered: 10/19/00
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I can't access the site!!! Keep getting 404 error [Bad Request]!!!

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#17582 - 12/02/02 06:50 AM Re: help with lighting demand!!!
Fredmeister Offline
Member

Registered: 11/26/02
Posts: 23
Loc: Beacon, NY, US
The preferred solution to this:

All this room needs is one Direct/Indirect 8Ft Fixture. You could use T8 or T5.. your choice. ( 4lamps - 2 Ballasts)

T8 will give you .83 Watts/sqft - T5 will come in at 0.94 watts per sqft.

Make sure that the fixture being used has the right optics to cover the area. Most of these types will.

Regardless of any Energy Codes, this will produce a very well lit office. Tell your client to put a Task Light ( Table Lamp or Under Counter Light) where needed.
Btw.: These are excluded from the Lighting calculations because they are plugged in.

The Price for such a Fixture is about the same as 4 good Lay-in Parabolics but the indirect ones will pay for themselfes in no time flat if you consider the energy savings.


Fred

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