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I'm currently in the process of evaluating this NL502 touchscreen controller and if all goes well (and so far it is) the TC420 will finally be phased out entirely.    I'm also working with the TC421 and it's been working better than most of the TC420s I still have in stock, but I still see some of the random "mode swtiching" issue that came to plague the TC420; requiring that I change to only loading up one program mode at a time on a TC420.   Having run the TC420 for about a decade on my own setups, putting a heavy...

The quality control of the TC420 digital LED controller has been slipping ever since 2020; it's to the point now where changes to my approach and product offerings must be made. One of the main selling points of this controller was its ability to have a full menu of preprogrammed cycle and intensity level options, giving you, the end user the ability to follow a seasonally adjusted approach which could mimic the natural cycles of any tropical or temperate biome.  I normally ship each TC420 with 4 different light cycles (11, 12, 13 and 14 hours) with 4 different intensity...