600watt nono for cllones starting out. use floros 24/0 until they are nice and stong then move under 600watt 18/6
if they are just stating thats too much light for babies.
depends on how you apply the light.
it can be done with a 1000w hps ??????????
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To much light will promote new growth to the top of the plant ....you only need 20 watts to clone..lower wattage makes that plant concentate on root growth... not new leaf
i use cfls to start then mh. i dnt see the point in starting clones under hps or mh. my opinion big waste but to all there own