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Old 09-06-2009, 08:14 PM   #16
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T8 vs. T12 Ballasts


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Originally Posted by kbsparky View Post
My experience has been the opposite. The electronic ballasts are much more prone to failure than the older, magnetic type ballasts ever were. A simple surge can zap the electronics, while the older ones would keep humming along for years.

Most of the ballast failures I have seen are as follows:

Electronic: less than 5 years old, many of these less than 3 years old.
Magnetic: 10-20 years old. It's rare to see a bad magnetic one that is less than 7 years old.
But you have to admit that the Electronic ballasts have one advantage over magnetics. The weight. When you had to drag the replacement up 15 feet in a crowded store, you had to worry about it or its served-out companion not falling on someone's head! And then at night worrying whether you fastened the (Hexagonal) nut all the way! (I'm just dramatizing the situation. Things weren't all that bad). (No matter what) Don't Drink and Drive, Ever!!!

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Old 09-06-2009, 08:57 PM   #17
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T8 vs. T12 Ballasts


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Originally Posted by micromind View Post

The instant-start (by far the most common around here) has one wire to each end of each tube. It uses shunted tombstones

The programmed-start has two wires to each end of each tube. This type obviously uses non-shunted tombstones.
I thought that is how it is. I looked up an advance ballast and they call it Program Rapid start.

You were just screwing with me before, weren't you Rob?


Ahem!!. hasn't anybody noticed mag ballasts are not available anymore for many applications? The fed took care of that

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In April 2005, ballast efficacy standards mandated by the U.S. Department of Energy (DOE) went into effect.

This standard officially outlaws the manufacture of magnetic ballasts for standard T12 40-watt, 4-foot fluorescent Rapid Start lamps, 75-watt 8-foot fluorescent Slimline lamps, and 110-watt, 8-foot fluorescent High Output lamps used in new fixtures.
a few years ago there was a rash of defective electronic ballasts of various applications. I had one customer that had all new fixtures installed a year or so before I started doing their work. I simply stopped by about once a week and replaced 2 or 3 or 4 ballasts each trip.

I believe it was due to a capacitor problem which, from what I understand, was a supplier to many of the major ballast manufacturers. I think they have it under control but I do not know how many units are still setting on shelves somewhere waiting to be a PITA.
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Old 09-06-2009, 09:15 PM   #18
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T8 vs. T12 Ballasts


Programmed rapid start; that's the term. I couldn't remember exactly what they called it.

My failure rate experience with electronic ballasts is about the same as anyone elses. I should have been more clear in my previous post, I was comparing the two types of electronic ballasts.

In my experience, the failure rate of programmed rapid start ballasts is slightly higher than instant start. The failure rate of either type of electronic ballast is far greater than the older magnetic type.

Quite a few years ago, our company did a high school with all electronic ballasts. There were thousands of them. After it opened, every saturday I would go there with several cases of ballasts. I'd just pick up where I left off , and spend all day replacing electronic ballasts. I think I replaced every ballast in that entire school at least once. The new ones weren't much better.

That was about 15 years ago, but I still have a bad taste for electronic ballasts, though I realize they're much better these days.

Rob

P.S. I knew you'd keep it alive, nap, and I knew that between the two of us (and some others) we'd provide a pretty good education about ballasts.
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Old 09-06-2009, 09:55 PM   #19
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T8 vs. T12 Ballasts


Hello capt.2

Hope you got all that, by now you got the right lamp, and everything
is working just fine.

But remember, when a thread is started, they kind of take on a life of
their own.

The more we post, and others post back, the more we all learn.

As for you capt,2 there going to be a test 1st. thing Tuesday,
morning.
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Old 09-06-2009, 10:50 PM   #20
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T8 vs. T12 Ballasts


Let me add a tibbit or few in here.

With electronic ballast what I know many of them just can't take the surge very well. { I go thru alot of them in both USA and France so no diffiernce on them }

Instat start useally last little longer than programed rapid start set up.

The other thing make sure you have grounding conductor bonded very well if you replace the ballast make sure you have good connections there otherwise it get funky { I get a bit with dimming ballast merde ! }

Nap., I don't know if you recall this or not but some shunted tombstone do have letter " S " embossed on them but with French system yeah they are stamped so you can not miss it by kilometer.

The other issue is improper burn in bulbs if used on switch that on / off pretty often they will have very lousy life unless you preburn them stay on for first 100 hours after that it will be fine. { ditto with dimming ballast set up as well }

Merci,Marc
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Old 09-06-2009, 11:48 PM   #21
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T8 vs. T12 Ballasts


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The other issue is improper burn in bulbs if used on switch that on / off pretty often they will have very lousy life unless you preburn them stay on for first 100 hours after that it will be fine. { ditto with dimming ballast set up as well }

Merci,Marc
I love that about the lights. When building a new building where I can control the lights, 100 hours is no problem but when going into an existing building, they get until the folks go home that night and off they go.
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Old 05-14-2010, 07:00 PM   #22
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T8 vs. T12 Ballasts


The main difference between T8 and T12 is the diameter of the bulb. T12 bulbs are 1 inch 1/2 while T8 are 1 inch. T12 also use more energy to produce light compared to T8. However, if you are looking to get a bulb that is efficient and consumes less electricity I recommend you consider using T5 bulbs. They are the most efficient fluorescent tubes currently on the market. If your current fixture is designed for T12/T8 you can still use T5 if you retrofit them.

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Old 05-15-2010, 04:25 AM   #23
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The main difference between T8 and T12 is the diameter of the bulb. T12 bulbs are 1 inch 1/2 while T8 are 1 inch. T12 also use more energy to produce light compared to T8. However, if you are looking to get a bulb that is efficient and consumes less electricity I recommend you consider using T5 bulbs. They are the most efficient fluorescent tubes currently on the market. If your current fixture is designed for T12/T8 you can still use T5 if you retrofit them.
There one issue you have to watch out with T5 most have non standard length to the bulbs { most I ran into are metric sized yeah ., I know for the fact due I deal few T5 in Wisconsin and a bit in France so I am not amused with it}

but for everything else other members allready address it.

Merci,Marc

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