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GE American Fluorescent PowerGroove F96PG17-CW |
Further increased output proved difficult to achieve, owing to the physics of the low pressure mercury discharge which becomes increasingly inefficient at higher loadings due to increased electron density. Mercury ions begin to come into Local Thermal Equilibrium with the electron temperature, and their rate of quenching almost equals the rate of excitation. The output of standard lamps cannot be increased by more than 2.5 times even at any power input.
The problem was solved by John Aicher and Eugene Lemmers of GE, who had invented a high ouput non-circular fluorescent lamp in 1943. The further improved shape of the PowerGroove lamp featured here allowed an increase to 2.2 times the normal light output with only 2.5 times the power dissipation. The indented glass tube decreases the distance mercury ions diffuse to the wall, thereby increasing the ambipolar ion loss rate, which in turn increases electron temperatures. This leads to reduced electron density, and hence increased lamp efficacy. The first lamps had long single-sided grooves, and lamp power and output were increased further in 1960 with this double-grooved lamp, which fits the arc of a 9-foot lamp into an 8-foot tube. Mercury vapour pressure is kept low (to maximise efficacy) by two special slanted grooves which produce a cool spot near the tube centre, and two missing grooves at one end.
| Manufacturer: | General Electric U.S.A. | |
| Lamp Power: | 215 Watts | |
| Lamp Current: | 1.50 Amps | |
| Lamp Voltage: | 163 Volts | |
| Cap Type: | R17d | Aluminium |
| Bulb Type: | TD-54 | TD-17 in eighths/inch |
| Bulb Finish: | Cool White | 3Ca3(PO4)2.Ca(F,Cl)2:Sb,Mn |
| Electrodes: | Triple-Coil + Anode Plates | Triple Carbonate emitter |
| Discharge Length: | ||
| Atmosphere: | Hg | Ar | |
| Luminous Flux: | 14,000 lm (@ 100h) | |
| Luminous Efficacy: | 65.1 lm/W (@ 100h) | |
| Colour Temperature & CRI: | CCT: 4100K | CRI: Ra60 |
| Chromaticity Co-ordinates: | CCx: | CCy: |
| Rated Lifetime: | 10000 hours | |
| Warm-up & Re-strike Time: | 1 minute | Instant |
| Burning Position: | Universal | |
| Nominal Length: | 2438 mm | 96 inches |
| Factory: | Circleville OH | U.S.A. |
| Date of Manufacture: | August 1987 | |
| Original Value: | ||
