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| Manufacturer: | The British Thomson-Houston Co. Ltd. | |
| Lamp Power: | 0.5 Watts | |
| Lamp Current: | 2 Milliamps | |
| Lamp Voltage: | 100-260 Volts (Requires External Resistor) | |
| Cap: | B22d/22 (Brass) | |
| Bulb Finish: | Clear | |
| Bulb Type: | S-28 | |
| Overall Length: | 56 ± 3 mm | |
| Light Centre Length: | Not Published | |
| Electrodes: | Split Ring | |
| Atmosphere: | 1.5% Argon in Neon | |
| Luminous Flux: | Not Published | |
| Luminous Efficacy: | Not Published | |
| Colour Temperature & CRI: | Not Published | |
| Chromaticity Co-ordinates: | Not Published | |
| Rated Life: | Not Published | |
| Factory: | Ponders End | England |
| Date of Manufacture: | September 1950 | |
| Original / Present Value: | Unknown | |