[Equest-users] fluorescent lighting W/sqFT

[Nick Caton]

Hi Derek!

Short answer - ask the lighting designer ;).

Detailed answer:  A "4ft fluorescent light" as described could draw a
wide range of input watts.  If you need to arrive at the answer without
the lighting installer/specifier handy, you must figure out the input
watts per ballast.  If you can't read a make/model from an actual
installation, first identify the type and quantity of lamps per fixture
(i.e. 4-32WT8, 2-54WT5HO, 1-28WT8).  Identify any other specs including
specified ballast factor, power factor, whether it's dimming, etc.
Armed with that info (or a make/model), turn to catalog data to
determine the input watts.  Advance has a relatively handy lookup tool
online I'd recommend where you can generate a representative cut sheet
based on known properties.  Phillips, Sylvania and I'm sure others make
good ballast catalogs in print as well.

Input Watts/ballast * Ballasts per fixture * Fixture Quantity / Building
Area = Watts per square foot

The total is "linear" in the sense that there aren't any diversity
factors involved in installed LPD calcs... at least in a context typical
for this mailing list (energy modeling / 90.1 / LEED / etc). 

If you're asking about electrical service calcs (NEC), this is probably
the wrong forum (I'd suggest searching/asking within
http://forums.mikeholt.com/).


~Nick

NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com 


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Derek W
Kultgen
Sent: Tuesday, April 05, 2011 4:29 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] fluorescent lighting W/sqFT

Hello All:

I was just wondering if anyone knows the W/sqFT value for a 4ft
fluorescent light. If there's multiple is there a scale to use or is it
just linear because there will be 40x 4ft lights in the building I'm
modeling.

Thanks,
Derek Kultgen
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