If the led downlight have blinking problem, most possibly the there are problem in the driver ( transformer) . Then we need to replace a new led transformer for it.

How to choose a suitable transformer for the led downlight?

First we need to know the output voltage and output current for the old driver.

for example, in below driver, the output voltage is 25-42V, output current is 135mA

the new transformer needs to have same output voltage and current.