After reading other reviews, I was very, very careful installing the light kit to avoid pinching any wires. I watched the how-to-video rather than using the instruction booklet (thank you for the video, so much easier). Unfortunately I must have pinched something at the end because I lost power to the last 3 lights. Still looks good though! I appreciate that Lightailing uses real Lego pieces to make their kits. Great, thought out packaging and well worth the money.