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RE: Preventive Maintenance For Lamps
- Subject: RE: Preventive Maintenance For Lamps
- From: "Reibstein, Rick (ENV)" <Rick.Reibstein@state.ma.us>
- Date: Tue, 31 Aug 2004 13:32:39 -0400
- Cc: "Althoff, David" <email@example.com>
- Delivered-To: firstname.lastname@example.org
- Delivered-To: email@example.com
- List-Name: p2tech
- Reply-To: "Reibstein, Rick (ENV)" <Rick.Reibstein@state.ma.us>
- Thread-Index: AcSPbHXRHH0jqJGnSrColM9KmtvCqgAEzJLA
- Thread-Topic: Preventive Maintenance For Lamps
this discussion about how it can be economical to change out still-functioning
bulbs, which I am sure is true, might there be something we can do with those
still-functioning bulbs? Why not store them somewhere and use them in
easily-accessed locations, where there is no critical problem about a loss
of function, and where this is no particular labor saving in changing them
out with all the others? I can see some of them being taken
from the high ceiling you have to get out a big ladder to deal with, when
it makes sense to change out everything, and then being used in the office
hallway for a few more months, where it's no big deal to reach up and
change them out one at a time. Why don't we suggest that companies let
employees take them home if they want? There must be any number
of old-age home options for bulbs to live out their
remaining time happily.
Jeri Knaus from the
Illinois Waste Management and Research Center contributes the following on
In response to Judy Kennedy's question regarding
I just read "Lighting Upgrades - A guide for Facility
edition, written by Damon Wood, CLEP, LC. Mr. Wood was
responsible for the EPA Green Lights program. There is an
chapter devoted to lighting maintenance, some very technical,
calculating lamp lumen depreciation and luminaire dirt
creating the light loss factor. He also talks about saving
through improved maintenance.
Here are a couple of excepts
from the chapter that might be helpful:
costs associated with fixture relamping
and cleaning can be cut by over 70
percent; expense of lamp purchases
can be reduced through fewer, higher
volume transactions. ...improved
maintenance practices...more lighting
value per dollar expended."
"Many maintenance managers are hesitant to
replace lamps that are still
operating. But after comparing the average
annual cost of sporadic spot
maintenance to that of group maintenance (i.e.
have decided to switch to a group maintenance
"To determine the optimal time to group relamp, refer to the
mortality curve (there is a table in the book) which represents
cumulative percentage of lamp failures that occur over time.
rate of fluorescent lamp failures becomes significant at
70 percent of rated life, HID relamping intervals are
scheduled between 60 and 70 percent of rated lamp life, depending
cost of spot-relamping failures that inevitably occur before
relamping is performed."
Hope this is helpful. This book can
be found at
At 12:53 PM 8/30/2004, Illig,
The concept of changing out all lamps at the
same time can be economical pending actual circumstances. Some items
to consider are:
1) Nearly all lamps have a loss of output over time.
The largest drop in output typically occurs during the last few thousand
hours of lamp life. If all lamps were installed at the same time, the
thinking is that once several lamps burnout that the rest of the lamps are
already functioning at or near reduced output levels and are also due to be
changed. Inexpensive lamps – like fluorescent – help make this
2) If your staff needs to rent a lift to access lamps in high-bay areas,
rent may be reduced doing all lamps rather than renting a unit several times
3) Maintenance costs can be a large part of lamp replacement. If
you consider hauling a ladder out every time a few lamps burnout the time
and effort adds up. It can simply be more efficient labor-wise.
One LARGE benefit of LED or induction lighting is the exceptionally long
life – 25+ years and ~10 years, respectively - and reduced maintenance
4) If your business has scheduled shut-downs for maintenance, it may be
easier to change out all lamps at that time rather than when actively
producing. Food processing operations or anyone operating 24/7 might
be an example where added care may be needed changing out lamps.
Commercial operations may be another example of where public perception
makes it more appealing to get the job done rather than have a ceiling
dotted with burnt out lamps. Remember, although the lamp is burned-out
the ballast continues to operate. Like idling your car engine…zero
miles per gallon.
Unfortunately, I have no case studies on the
topic. Check with a lighting professional. A good one should be
able to paint a much clearer picture.
firstname.lastname@example.org [mailto:email@example.com]On Behalf Of
Kennedy, Judith C.
Sent: Monday, August 30, 2004 12:34
Maintenance For Lamps
anyone provide me with some information on preventive maintenance programs
for commercial/industrial lighting, where all lamps are periodically changed
at the same time, whether they need it or not? This is supposed to
save much money. How does one determine the frequency of
change-out? How does one estimate the potential savings? Are
there any good case studies out there? I would appreciate any
information or leads you might have.
Hazardous Waste and Toxics Reduction Program
State Department of Ecology
Phone (360) 407-6385
Fax (360) 407-6305