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Mario Bertorelle Delta Table Lamp

Materials: Triangular black plastic base. Slidable rectangular lampshade. Aluminium reflector. White plastic diffuser. Porcelain socket.

Height: 19 cm / 7.48”

Width: 9 cm / 2.75”

Base: 22 cm / 8.66”

Electricity:1 bulb halogen R7s, 1 x 50 watt maximum, 12 volt/220 volt.

Period: 1980s – 1990s.

Designer: Mario Bertorelle.

Manufacturer: J.M. – R.D.M. Srln, Via Roma 31, 35010 Massanzago, Italy.

Other versions: The Mario Bertorelle Delta table lamp was also made in white and black and white.

This table lamp is named Delta. Delta is the fourth letter of the Greek alphabet: Δ. This lamp has the shape of the Greek letter.

Often said that these lamps are from the 1970s, but they are not. Mario Bertorelle designed several lamps and they are all patented in between 1987 and 1992. They have names such as Proteo, Ellisse, Disco, Delfino and the Delta table lamp. This Delta lamp was patented in 1992. It was described as “Lamp with optical part incorporated in a stem which is slidable on a supporting base”.

J.M. – R.D.M. Srln

The Tuscan company J.M. – R.D.M. Srln was founded in 1979 as a manufacture of articles in plastic materials. It was first named JM Illuminazione and was founded by Mario Jannuzzi (JM).

J.M. – R.D.M. Srln ended business around 2012. Today (2019) a supermarket “Alì Supermercato” is located at the address.

For the moment no information can be found about the designer Mario Bertorelle, unfortunately.

VLM Components

All the electric parts were made by VLM Components since the late 80’s, early 90’s.

VLM Components was founded in 1945 in Buccinasco, a small village near MilanItaly. The company is part of the Relco Group, founded in 1967. Today they are the owners of the brands RelcoLeuciRelco LightingVLM Components and Segno. VLM Components became famous for the switches they produce which were designed by Achille Castiglioni in 1968.