Initial testing on Litek lamps. [Litek]
The electrical, photometric and color-rendering characteristics of nine Litek lamps were measured prior to life-testing. This memorandum describes the testing process and the results. Lamp No. 1 (56.8 lumens/watt) shows the highest efficacy of all lamps tested due to the use of faster switching field-effect transistors in the driver. The average peak light output of the remaining eight lamps is 1665 lumens with an average peak efficacy of 52.5 lumens/watt. Standard deviations for luminous flux and efficacy (+-107 lumens and +-2.5 lumens/watt, respectively) indicate the variability within this small sample of lamps. To obtain widespread use in the residential sector, an energy-efficient replacement for the incandescent lamp should have the following properties: high efficacy (preferably three times as efficient as the product it replaces), good color rendition (at least 50%), small size and light weight, ability to burn in any position, and instant start capability. In addition, the product should be ''cost-effective'' in a life-cycle cost analysis. The Litek lamp prototypes submitted to LBL meet all these specifications except for color rendition. As discussed, the color-rendering properties of these lamps can be easily improved by adjusting the mix of the three component phosphors. It should be recognized that these lamps are prototypes and that product performance could be enhanced by various methods. In particular, efficacies over 60 lumens per watt may be possible by optimizing the lamp shape. Improvements in the efficiency of the driver may also be possible. If the electrodeless fluorescent lamp can be sold to the end user at $10 to $15, it can be considered a viable and economical replacement for the incandescent lamp in the 1980's. 8 figs., 2 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5430576
- Report Number(s):
- LBL-19857; ON: DE85016627
- Country of Publication:
- United States
- Language:
- English
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