replying to Don Klipstein, Mike Graham wrote:
I replaced both ballasts in .my four fixture Kitchen light. The ballasts
claimed for two
40w T12, or Twould 32w T8. The T12 bulbs would start the shimmering after
about 30 mins. It got so irritating After trying all suggestions , the tube
where replaced with 32w T8,s. The problem is solved. No real perceptible light
difference.
That's only an observation though. Thx.

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