Ceramic metal halide daylight lamp

A technology of halide lamps and ceramic metals, which is applied in the direction of discharge lamps, gas discharge lamps, parts of gas discharge lamps, etc., and can solve problems such as low lumen retention

Inactive Publication Date: 2009-09-02
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The lumen maintenance of these fluorescent lamps has improved significantly, but is still far below the desired lumen maintenance, such as 90% lumen maintenance after 1000 or even 2000 hours of operation

Method used

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  • Ceramic metal halide daylight lamp
  • Ceramic metal halide daylight lamp
  • Ceramic metal halide daylight lamp

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] A set of ceramic metal halide lamps with a power rating of 400W was prepared for evaluation, the fill containing Xe at a fill pressure of 85 Torr, dosed at a dose of 3.2 mg of a mixture of mercury (Hg) and 35 mg of metal iodide, metal iodide The weight percent of the mixture is as follows:

[0033] Sodium iodide (NaI): 6%

[0034] Calcium iodide (CaI 2 ): 7%

[0035] Thallium iodide (TlI): 1%

[0036] Thulium iodide (TmI 3 ): 82%

[0037] Dysprosium iodide (DyI 3 ):2%

[0038] Holmium iodide (HoI 3 ):2%

[0039] The lamp had an average efficacy of 86 lm / W, a CCT of 5000k, a CRI of 87, an MPCD of 4.7 and a voltage of 89V. At 2000 hours, the group delivered a luminous flux of 34,400 Im with a small color shift (55K) and good lumen retention (91%).

[0040] Table 1 shows the color temperature shift and lumen maintenance from 100 hours to 2000 hours for Example 1 of the invention and two manufacturers' quartz metal halide daylight 400W lamps. It is clearly seen t...

example 2

[0048] Four ceramic metal halide lamps similar to the metal halide lamp of Example 1 and having a rated power value of 150 W were prepared using a metal halide salt mixture as follows: 33.6% by weight of NaI, by weight 5.4% TlI and 61% GdI by weight 3 . The average photometric data are as follows: CRI=91.1; CCT=5905K; MPCD=8.4; voltage=100V; efficacy=77.1lm / W; luminous flux=11,565lm.

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PUM

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Abstract

A ceramic metal halide lamp (1) of the present invention has a ceramic discharge tube (3) and two electrodes (4, 5) mounted in an outer glass envelope (2). The discharge tube (3) is filled with mercury, a starting gas such as xenon and a mixture of metal iodides including in weight percent (wt.%): about 5-35% sodium iodide, about 1-6% thallium iodide, about 55-86% thulium iodide and / or dysprosium iodide, about 0-15% calcium iodide and about 0-31% of dysprosium and / or holmium iodide. The lamp has a light output characterized by a relatively high color temperature (around 5000K or higher), making it suitable for use as a daylight lamp.

Description

technical field [0001] The present invention relates generally to high intensity discharge (HID) lamps and more particularly to a ceramic metal halide lamp having a high color temperature. Background technique [0002] Certain outdoor lighting applications, such as urban landscaping, prefer lamps with high color temperatures. Some lighting manufacturers produce quartz metal halide HID lamps with a high color temperature of about 5000K to meet market demand. [0003] These quartz metal halide lamps are called "daylight" or "natural daylight" lamps because their lumen output has an emission spectrum closer to natural daylight than lamps with lower color temperatures. However, from lamp to lamp, these quartz metal halide lamps have a large initial color distribution and a large color shift over their lifetime. Furthermore, over their lifetime, their lumen output, efficacy and lumen maintenance are not ideal. [0004] There is a need in the market for a high color temperature...

Claims

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Application Information

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IPC IPC(8): H01J61/12
CPCH01J61/125H01J61/827
Inventor J·涂J·J·帕尔默G·A·戈尔丁
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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