gREEn7o0answered grow question 3 years ago Honestly looking at what you got there you could run just one light. If the net/screen was full of foliage having both would be beneficial. As your plant is now you could have a single centered light and the leaves would be getting the same amount of light they are now.
As for dimming, let your plant guide you. Some plants can suck up all the light you can give 'em, others not so much.
There are general guidelines on how much light you need and at which point there is diminishing returns. A good write up can be found here https://420expertguide.com/resource/grow-light-par-ppf-ppfd-values-decoded/ Keep an eye on your plant and look for signs of stress, if she looks happy, she probably is.