New Grow Seedling Lighting Question

I have one grow going under a CFL lighting solution however I started a side grow and didn't have anymore setups for CFL so I pulled out a LED grow light I've used for other small plants I've starts in the window sill(I've linked a similar one below). Curious how long that I can run my new seedling grow under something like this before switching to a 150w led panel grow lamp which I'm waiting on delivery but due to shipping won't be here until first part of June.


Side note I know I'm using two different lighting solutions. If anyone has any grow tents that can fit like one or two plants in a VERY small space I'd like to hear them. Smallest I found was like 2' x 2' x 4'. Ideally it would be nice to have something like 18" x 18" x 36"
 
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