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Radiation apparatus with an adjustable emission of ultraviolet radiations
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Optical transmitter or amplifier
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An optical emitter or amplifier of the kind which uses a selectively fluorescent medium for radiating
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An instrument for counting the number of particles contained in an optically transparent fluid
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Liquid-cooled hydrogen electric discharge lamp
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Device for introducing light into glass fiber bundles
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Water-cooled hydrogen lamp
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Light and weather fastness tester
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Apparatus for testing a material's reaction to illumination and humidity with capacitor-type humidity detector
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A tubular lamp surrounded by a coaxial transparent tube
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A light measuring apparatus
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Luminaire and spotlight housing with reflector
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Operating light
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Operating light
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Improvements in or relating to lighting installations
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Optical transmitter or amplifier
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Optical transmitter or amplifier (laser)
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Light and weather fastness tester
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Operating light with swivel arm
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