Green Light is a professional fertiliser used to really 'green up' an established turf. With high Nitrogen and Iron to give your lawn a deep green colour. Typically, professional turf carers use this product before tornaments to get the turf looking the best it can.
Green Light is a great product. A foliar spray application that wil have a dramatic effect on your lawn and give you that deep green you are searching for. Caution when applying this product as it may stain hard surfaces due to the iron content.
Feel free to discuss this product here. Here is a video to help you with the foliar application of Green Light. It uses an example of Launch+, but the method of this video applies to all foliar applications. Application rates differ for different products. Always follow the recommended application rate.