Low lighting for Coral.. will opening my window blind help?

My aquarium has low lighting and the only piece of coral I have in there is a small frag of star polyps. I know they can live in low lighting but I was wondering if opening my blinds to the window will help the corals out a little more until I get my new light fixture? I only realized how low my lighting really was after I had already purchased the star polyps. My tank is litterally between 2 windows, so would opening the blinds and letting natural light hit the tank help the polyps? Should I allow a little sun in too or would that be too risky?