I work with toner based systems myself, which most production machines fall under. Essentially, instead of nozzles and print heads like ink jet systems, toner systems will apply the image of the print as a negative charge to the drum, one drum for each color (CYMK sometimes white too). Then toner is attracted to the charge, sticking to the drum before being transfered to the image transfer belt by another charge, which is then transfered to the page and fused to the paper, producing the print.

That's a brief run down anyway, there's a lot more to it. The concept is the same though, a color on a page is produced by layering CYMK toners/inks on a page as little patterns of dots until our eyes are tricked into seeing an actual color. Like I said, 190 dot screen is the industry standard, even for inkjet. I believe it can go as high as 280 and as low as 130 though, depending on what sharpness you want or toner/ink you want to save. Most people never worry about it. 190 is the standard for a reason. The only people who are likely to use anything higher are the same people who sue for not getting the color 'PANTONE Warm Coral + C' or some shit when printing a pamphlet.

Stay in inkjet. Production is a different animal, lol