I use a Botanicare Aeroponic cloner, K-L-N rooting hormone and a single 28 watt GlowPanel45 over it for my clones.
It works fantastic.
I keep the LED panel about 4 inches above the clones.
Initially, I cut the clones at 4 inches in length. I then trim all but a few smaller leaves at the top. The rooting process is slowed by too many leaves. The clone will spend too much energy supporting the leaves and not enough growing roots of you have too many leaves on a cutting.
Then, I put each of the cuts into a 1 inch net pot with some hydroton and into the cloner.
The spray in the cloner runs 24/7, and after only 15 days, great roots form. I leave mine in the cloner for 35 days and they grow massive roots about 24 inches long using nothing more than the single 28 watt LED.
At 35 days, the clones are at about 8 inches tall with great branching and as I said, massive roots.
Then I carefully separate the roots and transplant them into my Ebb and Flow system where each plant gets a single 28 watt LED over it for another 35 days of vegging.
If you'd like to see the result of the vegging, here's the thread:
(Look at the pics from August 29th in post #1 and you'll see how they came out of the cloner)
Click Here:
https://www.rollitup.org/grow-journals/366584-pre1998-bubba-kush-grow.html