The most important thing to learn about your new LED grow light is the proper distance to keep it from your growing cannabis plants. The recommended distance varies greatly from LED model to model, but getting it right will make a huge positive difference in your results! So many growers unintentionally hurt their plants by keeping their LED grow light too close. 
Best Way to Avoid Problems with LED grow lights: Keep them the right distance away! 
If kept too close, LEDs may cause cannabis leaves to look discolored similar to a nutrient deficiency, even if nutrient levels are fine. 
This is especially common in the flowering/budding phase, especially towards the end of flowering when the same leaves have been directly under the LED for months. Discolored leaves don’t necessarily mean you’ve done anything wrong, especially if the LED grow light is being kept far enough away, but if you’re noticing it particularly near the lights, it’s a good indication it might be light burn. Most modern LED grow lights need to be kept at least 12-18″ away to prevent light burn.