The UV lamp features both long and short-wave ultraviolet bulbs and the cabinet contains a filter to help protect eyes from ultraviolet rays. The dual short/long-wave UV lamp enables checking for fluorescence; detects dyes, oils and assembled stones; and helps to distinguish natural stones from synthetics. Choose the open stand to save space where office lights can be dimmed. Lamp, cabinet and stand are all sold separately! We strongly recommend the use of the UV protective eye wear when using the open stand.