Up to 15000LM: Our construction string lights meet a variety of indoor and outdoor lighting needs at night with 150w power and 100ft overall length. 5000-5500K normal daylight color temperature, presenting the true color of the illuminated object. IP65 Waterproof: The string work lights have IP65 waterproof rating, which can provide secure and reliable lighting even in heavy rain and stormy weather environment. ETL Certified: ETL certified, suitable for parking lots, factories, workshops, warehouses, wharves, construction sites, mines, basements, storage areas, stairwells, and all kinds of indoor or outdoor places that need to be illuminated, with reliable quality and durability. Connectable Design: Each set of lights can be easily connected in series to become a wider work light stringer, providing even and stable lighting for the whole working area. The design of plug and play makes the lights more convenient