Im assuming you mean 24/0? And i used 20/4 actually for my clones and it seemed to work just fine, then i might even change it up to 18/6 after a week or so and just use the same light schedule i use to veg all my plants until they get to the size i want then its flower 12/12. But to answer your question either of those should work considering you didnt mean 24 light and 24 dark LOL.