Thanks for all of your replies.

With this information I am deciding to run my veg roomusing both 18/6 and 24/0.

I will veg my mothers with 18/6 most of the time. But when I fill the propagator with cuttings from the mothers I will run the lights @ 24/0 until the cuttings are rooted. Then once I see signs of all cuttings showing roots I shall revert back to 18/6.

I want strength and good root formation, so I will utilise both methods.