【8.5cm Solar Light Replacement Cap】This solar outdoor light bulb has a top diameter of 8.5cm and a bottom diameter of 7.5cm, making it compatible with most solar garden lights on the market. This high-quality solar replacement cap can restore the brightness of your worn-out solar lights and illuminate your garden. Please check the compatibility of your solar light size beforehand. 【Efficient Solar Panel】The solar outdoor light bulbs are made of monocrystalline silicon with a conversion rate of up to 35%, which provides a high efficiency higher charging capacity and longer lifespan than other solar panels. The solar light replacement cap also features a light sensor that automatically turns on at night by simply turning on the switch before use. 【Unique Lighting Design】The unique transparent design of the solar light replacement cap allows you to see the strong light transmission, emitting radiant light to illuminate your lantern. These beautiful outdoor solar bulbs are IP44