Check this blog, some of points should focus on when growers choice LED grow light.
The chips brand(Osram, Samsung, BridgeLux, Epistar or others), model(lm301h, lm301b, lm301d, 2835,etc), LEDs qty(some wattage, more chips, less light decay), PPFD uniformty(important), warranty and other service
Blog Link: https://www.mars-hydro.com/info/how-to-choose-the-best-led-grow-lights.html