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Tesla DZ*9W Compact Fluorescent |
In the Americas there was less incentive for innovation in compact fluorescents due to much lower energy costs, although Philips and Osram established satellite production in their U.S.A. factories, and the GE Biaxial lamps were also produced in America.
Meanwhile in Eastern Europe, several local manufacturers were quick to establish their own production. This remained on a small scale due to limited financial possibilities during the challenging political times for those countries. Only Tungsram achieved widespread success, following its takeover by GE of America and huge investments in the Hungarian manufacturing. Narva and Tesla also developed and produced these lamps for their local markets.
Tesla commenced production in the former Czechoslovakia during the late 1980s, and this is one of the company's earliest examples. It is an almost exact copy of the Philips design and was produced at the Holešovice factory in Prague - possibly even using a former Philips PL* production line. As such it was one of few manufacturers to adopt the Philips pi-shape rather than the simpler Osram U-tube. Following the privatisation of Tesla in 1991 it enountered financial difficulties, and although it survived for several years as Teslamp, the Czech production of CFLs ended with the closure of the Holešovice factory in August 2003.
| Manufacturer: | Tesla Holešovice | |
| Lamp Power: | 9 Watts | |
| Lamp Current: | 0.170 Amps | |
| Lamp Voltage: | 60 Volts | |
| Cap Type: | G23 | Al + PBT |
| Bulb Type: | T-12.5 | T-4 in eighths/inch |
| Bulb Finish: | Y2O3:Eu3+, CeMgAl11O19:Tb3+ | Soda-lime glass |
| Electrodes: | Triple Coil Tungsten | Triple carbonate emitter |
| Atmosphere: | Argon + Hg | |
| Luminous Flux: | 600 lm @ 100h | |
| Luminous Efficacy: | 66.7 lm/W @ 100h | |
| Colour Temperature & CRI: | CCT: 2700K | CRI: Ra 81 |
| Chromaticity Co-ordinates: | CCx: 0.460 | CCy: 0.414 |
| Lifetime: | 5000 hours | |
| Warm-up & Re-strike Time: | 2 minutes | Instant |
| Burning Position: | Universal | |
| Overall Length: | 168 mm | 65/8 inches |
| Lighted Area: | 106 x 27 x 13 mm | 43/16 x 11/16 x 1/2 inches |
| Mass: | 45 grams | |
| Factory: | Holešovice, Prague | Former Czechoslovakia |
| Date of Manufacture: | 1989 | Date Code: 19 |
| Original Value: | ||
