Old t5

[mikesilverado8888]

So I have 6 t5 bulbs I just replaced 3 and have 3 older ones. Last night the 3 older one durned out is that normal?

 

[pondman]

When I ran t-5s I would usually buy all the bulbs and I would replace them slowly over a week or so I've never had any that would just stop all together though. But I guess that could happen

 

[redfishbluefish]

I think the odds of three bulbs going at the same time are pretty slim. If so, go out a buy a lottery ticket NOW!

By chance are these three bulbs on the same ballast? I'd be looking at the ballast first.