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Question:

How can electronic ballast make a lamp tube bright

2 * 20W 1 to 2 series electronic ballast how can a lamp tube bright

Answer:

Remove a set of output choke and capacitance from the circuit board and use only one set
If it's an electronic ballast for constant current output, there's nothing wrong with a 20W lamp, if it's self-excitation (mostly), then a 20W machine will blow up.
Looking at the wiring diagram, it may be possible to attach a 40W lamp, which is difficult to estimate if you only want to pick up a 20W lamp.

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