Ultraviolet Light, 4W handheld blacklight ideal for forensics or illuminating fluorescent and blacklight reactive items. Also includes a built-in LED flashlight, Requires 4 AA batteries(not included), Dimension: 6 inch
Mercury light source, 20W low pressure discharge lamps for spectral work. Delivers approximately 100 lux at 20 cm with prominent lines at 434.7, 546.0, 577.0, and 579.1 nm as well as many faint lines.