Can you be specific about light output, both in terms of quantity (foot candles or any such metric), and quality (reference to emission spectra or color rendition index)? Enough LEDs put together may work; I seem to recall they are used in some of the brightest car head lights, so that's a pretty decent indication on strength. I have not looked at spectra, but there are some LED lights used in photography, so that is also a positive indication. In terrarium lighting, I've seen LEDs mostly as so-called moon-lights, and that is certainly too weak to grow plants.
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