The Y.Na-Mini LED Provides 18,500 LUX at 30cm for 9 hours continuous use. For intermittent use this may be extended. Hogies / Y.Na-Mini are supplied with 3AA disposable batteries. The in-line switch provides two levels of light intensity, high at 18,500 Lux and Low at 10,000 Lux. The narrow and light weight LED housing is ideal for co-axial presentation with all loupes offering fully illuminated “shadow free” and magnified vision.