_____________________________________________
From: Bill Musick
Sent: Wednesday, March 09, 2005 9:21 AM
To: Joanne Eckert
Subject: FW: Energy savings

-----Original Message-----

From:                     Bill Musick 

Sent:                      Wednesday, March 02, 2005 3:29 PM

To:                          Charles Soules

Subject:                 Energy savings

Chuck,

The general guidelines for energy savings that I use is:

1) If the light fixture has an incandescent bulb, I replace it with a compact fluorescent bulb with equivalent light output.  This usually cuts the power consumption to 20-30% of the original (i.e. 100W incandescent = 23W compact fluorescent also better lifetime, 2,000 hours (inc) vs. 10,000 hours (cfl)).

2) In facilities with older T-12 magnetic type fluorescent ballasts and bulbs, I replace them with T-8 electronic ballasts and bulbs as the old ballasts fail.  The 32W T-8's use about 1/3 less power vs. a 40W T-12, are 30% brighter and when one bulb burns out, the rest stay lit, unlike the T-12's. 

3) In parking lots that have 400W mercury vapor or metal halide, I usually try to substitute 250W high pressure sodium bulb and ballasts for the 400W MV or MH, unless there is an overriding concern for color of the light.  The HPS is an orange colored light with poor color rendering properties.  The MV is better, but contains mercury in the bulb and is hazardous to dispose.  The MH is better at giving truer color but, takes more power per lumen than the HPS and has a shorter bulb life.

The main buildings I have used these guidelines in, so far, are: City Hall, Airport Terminal, Neighborhood Resources, DG Co Sr Center and Fire Station #1.

Attached is a before and after of power consumption readings in the City Commission room when I changed the bulbs in many of the recessed can lights about 2 years ago.  Since then, I have not had to change a single compact fluorescent bulb.  I expect at least another year or two before any of them fail.  They have an expected lifetime of 6000 hours vs 2000 for the old bulbs. << File: City Commission Meeting Room.doc >>