Flowering help!

I dont know when to put my plant into flowering. Im not going for max yield as its my first grow an limited space.

At first i didnt have right medium or any nutes. Now i have coco coir as a medium, canna coco A/B an calmag for nutes.

My light i was told is a blurple. Cheap 60$ dollar light from ebay.

Now that i have my nutes right my plant has grown nearly 6 inches in the last 10 days.

When do i flower her??
 

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