Dietz Visi-Flash 650 barricade warning light

Visi-Flash was the trade name used by R.E. Dietz Company for their line of battery-powered transistorized barricade warning lights. In 1958, Dietz was the first company to offer battery-powered barricade lights. These lights are commonly seen along highway construction zones or other road and highway hazards. Before the development of these lights, oil-burning lanterns and "highway torches" which resembled cannonballs were used.

The main body of these lights were manufactured of steel and later high-impact plastic. The lenses used were mainly yellow, though examples of red, green and blue exist. Their internal circuits were either 6 or 12 volts DC. 12-volt units used a higher-candlepower bulb, though battery life was about half of the 6-volt models. These lights either blink or stay illuminated (no flashing circuit) depending on the model, with all models containing an on/off switch. Later models also used a photocell for dusk-to-dawn operation, which extended battery life. Both design voltages used two 6-volt lantern batteries. Certain models of these warning lights command high collector value. Several other companies also produced barricade lights, but Dietz Visi-Flash was by far the largest, selling them worldwide. The trade name Visi-Flash was later purchased by Reva Plastics Co. in the late 1980s. Reva Plastics Co. is no longer in business. (source: Wikipedia)

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