Sorry about your Juki disappointing you. My Juki 2010 has a bright LED light and it is bright for me. Could be the machine needed a new bulb? That was the case of mid range Brother machine I bought. The light was dim. Dealer put a new LED bulb (same type ) in and it made all the difference and it was a new machine right out of the box.
Julienm1:
Here is a video that is excellent for machine choices from $200 to $1000. Doesn't have to be that brand but gives you knowledge of what to look for
https://www.youtube.com/watch?v=ShXiPv5ZtOk&t=1567s