ГДР

The picture shows the oldest light bulb in my collection. I bought it last year. It's purple. It gets very hot. The filament is made from carbon.

NARVA HQA lamp with, from inside frosted outer bulb. From 1975 - very of of rare -  a FEW years the before the That time, the lamps Were Called HQA.

125W
1,15A
E27
7000h

A mercury vapor high pressure lamp from BGW with ignition electrode.

Lamp power: 500 W

Lamp current DC: 5.9 to 7.2 A

AC lamp current: 6.7 to 8.2 A

Lamp voltage: 70 - 85 V

System voltage DC: 110 V - 220 V + / 5%

System voltage AC: 220 V + / 5%

Lead Time: 5 - 8 min

Socket: M4 / M3 ignition electrode

Length: 172 mm

Light center: from the anode 70 mm

Burning position: Standing + / 20 °

Anode up

Ignition electrode not on the arc

Manufacturer: BGW

Lamp power: 400W

Socket: E40

A very early HQ lamp of BGW. One of the first high-pressure lamps. This lamp has a side-mounted auxiliary electrode.

Manufacturer: BGW

Lamp power: 120W

E27

A very early HQ lamp from BGW. Probably just a test lamp. The base of the lamp and the stamp of the lamp are very unusual.

Lamp power: 250 W

Lamp current: 2.13 A

Lamp voltage: 135V

Socket: E 40

Manufactured: 4th quarter of 1966