Indoor Seedling Light Schedule 24 hours? when start 20/4 schedule?

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Hello all...was wondering when I should start the 20/4 light schedule with seedlings? I have them on 24 hrs light right now. Thanks!
 
Why go to 20/4 at all? Others may disagree, but the consensus seems to be that running 24 hours, non-stop, does not detract and only can help with plant growth. So, unless you believe that 20/4 is better (which some or many do) or have another good reason, e.g., save 4 hours of electricity daily, why bother with 20/4, why play games with timers?
 
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