Abstract A lighting arrangement and lamp assembly particularly suitable for producing illumination with a minimum of the infrared range of wavelengths and especially suited for use in environmental growth chambers. The lamp assembly disclosed includes a tungsteniodide lamp positioned in a first housing member formed from a material which is transparent to light of a substantial range of wavelengths including infrared. A second housing member formed from a light-transmissive material is positioned about the first housing member in spaced relationship thereto. Means are provided to seal between the first and second housing members to provide a closed chamber through which illumination produced by the lamp must pass in order to escape from the assembly. Fan means function to pass cooling air through the first housing member and about the lamp positioned therein; and, means are provided for circulating water through the sealed chamber between the first and second housing members so that all the light passing from the assembly is filtered through the circulating water.
In an environmental growth chamber of the type including a test chamber portion having means for maintaining controlled temperature and humidity conditions therein, and including at least one electric lamp for providing high-intensity illumination in the test chamber portion, the improvement comprising: means for preventing light rays of the infrared portion of the spectrum from being conducted from the lamp chamber to the test chamber and simultaneously conducting away from heat generated by the lamps, said means including: airflow-producing means for passing air across said at least one lamp, first and second lamp housing members formed from light-transmissive material and positioned between said chamber portion and said at least one lamp, said housing members being spaced a shorT distance apart and providing a barrier for preventing air flowing across said lamp from entering said test chamber, and water supply means for conducting water between said housing members.
Claim 2
Dependent Claim
147 words
In an environmental growth chamber of the type including a test chamber portion having means for maintaining controlled temperature and humidity conditions therein, and including at least one electric lamp for providing high-intensity illumination in the test chamber portion, the improvement comprising: means for preventing light rays of the infrared portion of the spectrum from being conducted from the lamp chamber to the test chamber and simultaneously conducting away from heat generated by the lamps, said means including: airflow-producing means for passing air across said at least one lamp, first and second lamp housing members formed from light-transmissive material and positioned between said chamber portion and said at least one lamp, said housing members being spaced a shorT distance apart and providing a barrier for preventing air flowing across said lamp from entering said test chamber, and water supply means for conducting water between said housing members.
Claim 3
Dependent Claim
25 words
The improvement as defined in claim 1 wherein said housing members are tubular and positioned about said at least one lamp in generally concentric relationship.
Claim 4
Dependent Claim
22 words
The improvement as defined in claim 2 wherein said airflow-producing means is connected with the innermost housing member and conducts air therethrough.
Claim 5
Dependent Claim
13 words
The improvement as defined in claim 1 including a plurality of said lamps.
Claim 6
Dependent Claim
21 words
The improvement as defined in claim 4 wherein each of said lamps are provided with a set of said housing members.