Changes

First I would attach a funnel to a gutter. Within the funnel there will be 2 or more color lights. I'm not sure how many yet. The lights will shine down on the rain captured and escaping the funnel. This will be a broken circuit and will convert to a single or a double circuit depending on how hard it's raining. The rain will run out of the funnel and into the first smaller, metallic like funnel that will be attached to the positive end of the circuit. Then from that , depending on the strength of the rain it will complete a circuit by it reaching one or two other small, metallic funnels that are attached to the a wire that runs to a light then to the negative end of the circuit. This will be possible because of the nature of water. The hydrogen atom's attraction toward each other will keep the water together depending on the amount and velocity. That will create the bridge to complete the circuit. (This will have to be made waterproof).