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#6653 - 01/09/02 05:36 PM Lamp life hours  
Frank Cinker  Offline
Joined: Jul 2001
Posts: 311
Is there a website where I can go to compare lamp life hours? I'm interested in comparing 8ft long T-8 fluorescent lamp with electronic ballast to 8ft long slimline fluorescent lamp. Another question I have is: Are slimline lamps considered energy efficient.

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#6654 - 01/09/02 06:07 PM Re: Lamp life hours  
WARREN1  Offline
Joined: May 2001
Posts: 176
Greenville, SC, USA
If you need a manufacturer's rep telepone number, just email me.

#6655 - 01/09/02 10:09 PM Re: Lamp life hours  
Elzappr  Offline
Joined: Dec 2001
Posts: 270
One parameter that is consistently left out of discussion is the effect that frequent switching has on different lighting technologies. I'd like a source for some data that would explain lamp life to switching cycles. Then I could adequately advise my customers.

#6656 - 01/10/02 01:05 PM Re: Lamp life hours  
Frank Cinker  Offline
Joined: Jul 2001
Posts: 311
A person asked me a related question two days ago. What reduces lamp life hours more..... switching fluorescent lights on and off as needed or leaving them on 24hrs per day? This question relates to a large City firehouse garage. The garage lights are typically left on 24hrs a day. I suggested a spring wound timer if leaving lights on 24hrs a day would dramatically reduce lamp life hours. What is the opinion of the lighting experts out there?

#6657 - 01/10/02 10:43 PM Re: Lamp life hours  
watthead  Offline
Joined: Oct 2001
Posts: 172
South Carolina
I will offer you a little info gleaned from several years in the distributor business. The average life rating on a T12 Rapid Start Lamp operated on a rapid start circuit will be @18000 hours, while it would be @15000 hours on a preheat circuit. High efficiency T8 Lamps rating would be @15000 hours when operated on an instant start ballast, and @20000 hours when operated on a rapid start ballast. Although the newer 8' T8 lamps can only be operated on instant start circuits. To obtain the best life in 8' fixtures you would need to use the ones that require four 4' lamps. Along with the higher cost the high efficiency T8's are 40% more efficient when used with the electronic ballasts. They are also essentially flicker free which makes working under them much easier. One other often overlooked advantage to the electronic ballasts which is especially economical on large installations is the large amounts of heat produced by magnetic ballast is not produced by the electronics. This factor alone can more than offset the higher initial cost in a lower air conditioning load that can be factored into the job, both in a lower quantity installed and less power to operate. The average life rating is based on 3 hours per start operation. The lamp life hour ratings may differ from one manufacturer to another, but the percentages are probably close as far as how they relate to the circuit the lamp is operated on. The T8's and electronic ballasts cost more because they are worth it. The different circuits mentioned are the ballast options that are available. Did I leave anything out, or can go ahead and write this order up now?

#6658 - 01/11/02 06:37 AM Re: Lamp life hours  
Frank Cinker  Offline
Joined: Jul 2001
Posts: 311
Very good information. Thank you.

#6659 - 01/14/02 03:25 PM Re: Lamp life hours  
WARREN1  Offline
Joined: May 2001
Posts: 176
Greenville, SC, USA
AS a footnote to Wattheads post: Electronic ballast prices are coming down now that more are being specified by the engineering community. I think in the near future, places like HomeDepot, Lowes and others will be stocking more of these offerings. But your local lighting distributor should have them in stock now.

#6660 - 01/14/02 03:36 PM Re: Lamp life hours  
dana1028  Offline
Joined: Jan 2002
Posts: 163
San Carlos, CA
Mike Holt has this same thread - is a web site with studies on this very issue - lamp life/vs. energy costs, etc.

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