Inter Solar Systems [P] Ltd. Supplies Light Weight Solar Lantern. Inter Solar Systems [P] Ltd. Has obtained ISO 9001:2000 certifications. Inter Solar Systems [P] Ltd. Manufactures ISI marked solar energy products. Light Weight Solar Lantern is a portable and easy to operate device. Light Weight Solar Lantern is used for both community lighting as well as for domestic purposes. It helps in reducing electric power consumption and is easy to operate and handle. This system consists of solar cells, control panel and lighting devices.