Quote Originally Posted by elimuir
Yes, CLFs. I didn't know there was different heights for different bulbs.
During veg/flower for best results you should aim for 2-4" in my experience. A lot will depend on how good the airflow and extraction is within your setup and what size bulbs you are using. If you see a lip forming on the edge of your leaves they are getting a little too warm. If you do try and keep your lights really close, be extra careful during first 2 weeks of flower when the plants are stretching, you will find yourself having to adjust your lights every 1 or 2 days.