Light for small 20 gallon hex hood.

LR I bought yesterday had a small blue mushroom growing. I would like to try and keep it alive. I only have 25w flor in my 20 gallon hex FOWLR tank. Because of the small hood size I think I can fit a small srtip behind the one I have now, but only 12" or 14". I have seen two products, smartlights 14" compact and a mini-mites light that is smaller and not as strong. Anybody have these or know of any other rigs???