Though I can't imagine using anything that strong for clones.
Me either though, some here claim to clone in sunlight. I've found a single 23 watt cfl from several feet away is sufficient.
I think on average it's faster. The Reason I don't wnat to clone in Rapid Rooters or Rockwool or soil is because I want to "KNOW" when my clones have rooted. Not wait weeks for them to poke out of some cube.
You don't clone in a 6" cube but in 1" starters. I custom cut 3/4 inch cubes from a larger block (drops price about 90%). At most, this adds a day until you "see" the roots. Added bonus, they're planted and the roots most delicate area is protected.