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#172183 - 12/15/07 01:09 PM Energy savings from magnetic to electronic ballast  
ayrton  Offline
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


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#172185 - 12/15/07 01:29 PM Re: Energy savings from magnetic to electronic ballast [Re: ayrton]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,328
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


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#172187 - 12/15/07 01:59 PM Re: Energy savings from magnetic to electronic ballast [Re: sparkyinak]  
LarryC  Offline
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Joined: Jul 2004
Posts: 783
Winchester, NH, US
How about the reduction in heat generated?


#172190 - 12/15/07 02:19 PM Re: Energy savings from magnetic to electronic ballast [Re: LarryC]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,328
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 02:20 PM.

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#172195 - 12/15/07 04:40 PM Re: Energy savings from magnetic to electronic ballast [Re: sparkyinak]  
renosteinke  Offline
Cat Servant
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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.


#172229 - 12/16/07 12:50 PM Re: Energy savings from magnetic to electronic ballast [Re: renosteinke]  
ayrton  Offline
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 12:52 PM.

#172234 - 12/16/07 01:39 PM Re: Energy savings from magnetic to electronic ballast [Re: ayrton]  
Jim M  Offline
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Joined: Aug 2001
Posts: 457
Chestertown, MD, USA



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