ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Inspection camera help
by Bill Addiss. 09/19/18 10:50 PM
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
Lighting Load questions
by HotLine1. 09/14/18 07:04 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 20 guests, and 18 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Energy savings from magnetic to electronic ballast #172183
12/15/07 02:09 PM
12/15/07 02:09 PM
A
ayrton  Offline OP
Member
Joined: Dec 2001
Posts: 201
Pa
Does anybody know the formula for calculating energy savings from switching Magnetic ballasts and lamps, over to electronic ballasts and lamps for 2x4 lay in troffers.

For arguments sake, lets say 4 lamp fixture w/ 34 or 40w lamps magnetic

And 4 lamps 32 watts electronic

Work Gear for Electricians and the Trades
Re: Energy savings from magnetic to electronic ballast [Re: ayrton] #172185
12/15/07 02:29 PM
12/15/07 02:29 PM
S
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,335
Alaska
raob x volts x nof - ranb x volts x nof

where:

raob - rated amps of old ballast
volts - duh
nof - number of fixtures
ranb - rated amps of new ballast


"Live Awesome!" - Kevin Carosa
Re: Energy savings from magnetic to electronic ballast [Re: sparkyinak] #172187
12/15/07 02:59 PM
12/15/07 02:59 PM
L
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
How about the reduction in heat generated?

Re: Energy savings from magnetic to electronic ballast [Re: LarryC] #172190
12/15/07 03:19 PM
12/15/07 03:19 PM
S
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,335
Alaska
If it is a massive building then yes you could figure it in. I might have info on that. I will see If I can locate it. Living in AK, you do not really think of that since we only use AC in our IT rooms. Most buildings I deal with are for the most part are well insulated Any heat loss form the lights that is picked up by the heating systems would me insignicant.

Last edited by sparkyinak; 12/15/07 03:20 PM.

"Live Awesome!" - Kevin Carosa
Re: Energy savings from magnetic to electronic ballast [Re: sparkyinak] #172195
12/15/07 05:40 PM
12/15/07 05:40 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
Let me put it this way .... when I converted an office building from T-12's with conventional ballasts, to T'8's with electronic ballasts .... the math gave me a very conservative number! IIRC, I was expecting savings of about $250/ month .... while the actual saving was nearly $400/mo.

Actual amp readings, before and after, showed about a 35% reduction in current drawn. This is not considering the lesser load on the air conditioning, due to the lower operating temperature.

I was changing things 'bulb for bulb.' If you are replacing 4 lamp fixtures with 3 lamp fixtures, expect further savings.

Re: Energy savings from magnetic to electronic ballast [Re: renosteinke] #172229
12/16/07 01:50 PM
12/16/07 01:50 PM
A
ayrton  Offline OP
Member
Joined: Dec 2001
Posts: 201
Pa
I was thinking more of this formula

# of luminares x total W per luminare x Annual operating hrs x Energy cost per KWH= First year energy cost/1000

Knowing amperage is not accurate enough. There is input amps and out put amps. Example, a 400w MH fixture has a total input of about 465W Amperage on ballast is not accurate in my experience. Need to measure True Power (watts)

Last edited by ayrton; 12/16/07 01:52 PM.
Re: Energy savings from magnetic to electronic ballast [Re: ayrton] #172234
12/16/07 02:39 PM
12/16/07 02:39 PM
J
Jim M  Offline
Member
Joined: Aug 2001
Posts: 457
Chestertown, MD, USA


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,149
Joined: May 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 9
Popular Topics(Views)
249,296 Are you busy
187,229 Re: Forum
176,589 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.024s Queries: 15 (0.004s) Memory: 0.9870 MB (Peak: 1.1438 MB) Zlib enabled. Server Time: 2018-09-20 03:33:19 UTC