Before revision: This voltage ranges from 0.3 V for germanium diodes, 0.6 V to 0.7 V for silicon diodes, and from 1.6 V to 3 V for visible light emitting diodes.
After revision: This voltage is around 0.4.2around V for germanium diodes, 0.6 V to 0.7 V for silicon diodes, and from 1.6 V to 3 V for visible light emitting diodes.