windowsill grow/ LED light grow/ help please

i am growing some seeds in my conservatory at the moment in england this is just an experimant, i have orderd a 14watt led grow light with both red and blue lights, its only 12inch x 12inch and im only going to water the plants, no nuetriants or anything. but might try miracle grow on one or two. dose anyone have any tips for me? i am also a first time grower. the seeds i have are 4 big bang seeds from the green house seed co. and a lowryder auto flowering purple jem. i know the purple jem can be grow on a windowsill but will it grow under this light ive got????/ please help:joint::joint::joint::joint:
 
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