Return to the Lighting Forum | Post a Follow-Up

Startup delay on new T8 fixture

Posted by yam2006 (My Page) on
Thu, Aug 6, 09 at 11:03

I replaced four four-lamp fixtures (ie sixteen tubes total) from old worn-out T12 to new T8 fixtures. They are all controlled by the same switch.

Two of the new T8 four-lamp fixtures come on immediately, a third one comes on with a slight delay, and the fourth one comes on with an even longer delay, perhaps 0.5 to 1.0 seconds. I'm surprised and disappointed since I thought I wouldn't have to worry about these issues after upgrading to T8 and electronic ballast.

Do these two slow fixtures have a defective ballast? Are they going to get worse in cold weather, or after a few years of use? Is there any effect on their reliability or power consumption? Or is this all within the normal range, and I'm just noticing the difference because I have four identical fixtures right next to each other?

Follow-Up Postings:

RE: Startup delay on new T8 fixture

Initial thought is the ballast may be defective on said fixtures. Another option is the wiring, did you have them wired per the manufacturer's recommendations.
Last option would be to see if you have either a rapid start or instant start ballast.

RE: Startup delay on new T8 fixture

I think they are wired correctly. I re-used the existing wiring from each of the old fixtures. They are all in series with one another. The four new fixtures are identical.

RE: Startup delay on new T8 fixture

Well I replaced one of the ballasts this weekend. The behavior is still exactly the same. I also swapped the tubes from one fixture to another but still couldn't get the behavior to change. I'm a bit puzzled.

RE: Startup delay on new T8 fixture

Double check the wiring looking for cracks, creases etc. You mentioned you used the same wiring from the previous T12 for the new T8. Try new wiring to see if that makes a difference.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Lighting Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here