Grow lights question: I have been using 2 of these for 2 years:

https://www.amazon.com/gp/product/B019ETLC7M/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&th=1

VIPARSPECTRA 600W LED Grow Light,with Daisy Chain,Veg and Bloom Switches, Full Spectrum Plant Growing Lights for Indoor Plants Veg and Flower Actual Power 260 Watt

I have some wire metal shelf from Costco and I mount one on each shelf about 18 inches away. The manual said it should be 18-32 inches away to get the full range, but the first year they got super leggy.

The second year I turned up the brightness, started seeds later - less leggy.

However reading some posts, I'm wondering if the lights are too far away. However if I put them closer I'm afraid they will be too bright, and the edges of the shelf will not be bright enough.

The shelf length is 48"This one:TRINITY EcoStorage 4-Tier Wire Shelving Rack with Wheels, 48" x 18" x 72" , NSF, Chrome ColorI took out the middle shelf to get more room for the lights to be further away.

Is anyone else using these lights? Can I put them closer? Or should I have 2 lights per shelf?