The cost of 30 watt solar lighting varies widely, typically ranging from $50 to $150, 1, depending on the brand, quality, and additional features, 2, installation and maintenance costs may influence the total price, 3, quality and performance are crucial factors to consider. The cost of 30 watt solar lighting varies widely, typically ranging from $50 to $150, 1, depending on the brand, quality, and additional features, 2, installation and maintenance costs may influence the total price, 3, quality and performance are crucial factors to consider. Check each product page for other buying options. ClimeCo certifies products whose carbon emissions have been assessed, verified, decarbonized, and are on a committed path towards continual emissions reductions. Companies may pursue emissions reductions for products through various means such as. Check each product page for other buying options. Illuminate your outdoor areas with solar-powered pathway lights. A 30-watt solar light typically costs between $20 and $100, influenced by factors such as brand reputation, material quality, and additional features. This powerful light turns on at dark, goes to high power. The 30 Watt Commercial Solar Street Light Kit is a reliable way to light any outdoor area.