| F | SK | SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F21 | USK | LIGHTING; HEATING |
| F21 | KL | LIGHTING (electric aspects or elements, see section H, e.g. electric light sources H01J, H01K, H05B) |
| F21S | UKL | NON-PORTABLE LIGHTING DEVICES OR SYSTEMS THEREOF [1, 7] |
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| F21S 2/00 | HGR | Systems of lighting devices, not provided for in main groups F21S 4/00-F21S 10/00, e.g. of modular construction [7] |
| F21S 4/00 | HGR | Devices or systems using a string or strip of light sources [7] |
| F21S 6/00 | HGR | Devices intended to be free-standing (F21S 9/00, F21S 10/00 take precedence) [7] |
| F21S 8/00 | HGR | Devices intended for fixed installation (F21S 9/00, F21S 10/00 take precedence; using a string or strip of light sources F21S 4/00) [7] |
| F21S 8/02 | UGR1 | | . | of recess-mounted type, e.g. downlighters (F21S 8/10 takes precedence) [7] |
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| F21S 8/04 | UGR1 | | . | intended only for mounting on a ceiling or like overhead structure (F21S 8/02 takes precedence) [7] |
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| F21S 8/06 | UGR2 | |
| F21S 8/08 | UGR1 | |
| F21S 8/10 | UGR1 | | . | specially adapted for vehicles (arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q) [7] |
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| F21S 8/12 | UGR2 | | . . | providing a single shaped beam, e.g. asymmetric beam, e.g. for penetrating fog or for preventing glare [7] |
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| F21S 9/00 | HGR | Devices with a built-in power supply; Systems employing such devices |
| F21S 9/02 | UGR1 | | . | the power supply being a battery or accumulator |
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| F21S 9/03 | UGR2 | | . . | rechargeable by exposure to light [7] |
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| F21S 9/04 | UGR1 | | . | the power supply being a generator |
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| F21S 10/00 | HGR | Devices or systems producing a varying lighting effect [7] |
| F21S 10/02 | UGR1 | | . | changing colours (F21S 10/04 takes precedence) [7] |
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| F21S 10/04 | UGR1 | |
| F21S 10/06 | UGR1 | | . | flashing, e.g. with rotating reflector or light source [7] |
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| F21S 11/00 | HGR | Devices or systems using daylight (building arrangements in general, building details E04; windows or the like E06B) |
| F21S 13/00 | HGR | Devices or systems employing a point-like light source; Devices or systems employing a light source of unspecified shape |
| F21S 13/02 | UGR1 | | . | Devices intended to be fixed, e.g. ceiling lamp, wall lamp |
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| F21S 13/04 | UGR2 | |
| F21S 13/06 | UGR3 | | . . . | multi-branched, e.g. chandelier |
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| F21S 13/08 | UGR2 | | . . | with suspension from a stretched wire |
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| F21S 13/10 | UGR2 | | . . | with a standard, e.g. street lamp |
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| F21S 13/12 | UGR1 | | . | Devices intended to be free-standing, e.g. table lamp, floor lamp |
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| F21S 13/14 | UGR1 | |
| F21S 15/00 | HGR | Devices or systems employing light sources not covered by group F21S 11/00 or F21S 13/00 |
| F21S 19/00 | ZWE |
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| F21S 19/00 | HGR | Devices or systems employing combinations of electric and non-electric light sources; Replacing electric by non-electric light sources or vice versa |