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Discussion Starter · #1 ·
I have an All-Glass 48 inch twin tube strip light on my 75-gallon tank and it appears to be putting out less and less light. Even after I replaced the bulbs it still seems much dimmer then when I first got it over 4 years ago. Could it be that the ballast is wearing out and thus producing less energy for the bulbs or am I just imagining things? Thanks.
 

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Discussion Starter · #2 ·
I have an All-Glass 48 inch twin tube strip light on my 75-gallon tank and it appears to be putting out less and less light. Even after I replaced the bulbs it still seems much dimmer then when I first got it over 4 years ago. Could it be that the ballast is wearing out and thus producing less energy for the bulbs or am I just imagining things? Thanks.
 

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Without instruments, you can't be sure. At this point, you can only measure the lamp current to see if the ballast is in spec. You will need a current probe that can measure high frequency current if the ballast is a high frequency type. Otherwise, you have to just replace it.
 

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Discussion Starter · #5 ·
Just as an update I emailed All-Glass and their lighting department had never heard of something like this happening. They said that ballasts either work or they don’t and there’s no in-between.
 

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That's a flip reply. It is possible. I would certainly agree with them if they said it was unlikely. Most failures in power electronics equipment are hard failures. The smoke comes out and it stops working. But I have seen soft failures enough times that I do not agree that there is "no in-between".

On the other hand, troubleshooting this kind of issue is very difficult for a non-technical consumer. You need test equipment a hundred times more expensive than the ballast. So who is going prove them wrong, especially when they have a "can't happen here" attitude? If you return the ballast, will they test it for you? I'm guessing no. It will get trashed, and there will be no data to support or refute their claim.
 

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Discussion Starter · #7 ·
In the past I’ve had my All-Glass PC strip light go out and even thought it wasn’t under warranty they immediately replaced it so I’m sure if I really pushed it they would give me a new ballast for my NO strip light but unless it seems to get worse I’m I’ll stay with the one I have.
 

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could it be that the bulbs wore down, which they do and when you replaced them, the new bulbs where of a different spectrum, thus giving the appearance of less output?
 
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