The movable arm has a unique internal cantilever system that lets you adjust without loosening/tightening knobs. Perfectly balanced to hold position (also can be locked in position if necessary)
Brightech LightView Pro LED Magnifying Lamp - Full Spectrum
Energy-saving LED bulbs provide high-quality illumination and long life Dimming control, with memory, provides precision light intensity adjustment. The twelve 2-watt LED arrays provide excellent, uniform lighting. Control the light intensity with the precision dimming control.
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