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Have you checked that the supply is correct and stable ?

The older style floro tubes operated on a slightly lower voltage
than the newer quick start tubes.
You can tell the difference by looking at the diameter
of the floro tube, the older ones were larger in diameter.
So if you put a modern quick start tube into a fitting
designed for the older style tubes, it might not work correctly.

Also modern tubes do flicker more than the older ones,
Because they have taken the mercury out of the tubes.
Some new tubes will flicker for a short time (15 mins )
at first use, but this will fall away to a low level.
It is perfectily normal for them to flicker a little bit.
probably as a result of minimilist design and high efficency.
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