Indoor why is this thing so long

see I don't know what to do she's passed 91 days already and still ahs white hairs. the site said 6 weeks start to finish. the bottom nuggets are still quite small with white hairs and not red or orange hairs. I don't if I should carry on with 18-4 or put them on a 12-12? the main question is.
is more darkness what I need in order to finish her off or more light. im seriously confused here. ill post somepics up later to show you guys what I mean.
 
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