F21K2/00	7	Non-electric light sources using luminescence (using excitation by radioactivity G21H3/02, H01J65/06, H01J65/08; using excitation by an external electromagnetic field or by external corpuscular radiation H01J65/04); Light sources using electrochemiluminescence	F21K2/00	F21K2/00		1003
F21K2/005	8	{excited by infrared radiation using up-conversion}	F21K2/00	F21K2/00		50
F21K2/04	8	using triboluminescence; using thermoluminescence	F21K2/04	F21K2/04		68
F21K2/06	8	using chemiluminescence	F21K2/06	F21K2/06		509
F21K2/08	9	activated by an electric field, i.e. electrochemiluminescence	F21K2/08	F21K2/08		131
F21K5/00	7	Light sources using charges of combustible material, e.g. illuminating flash devices	F21K5/00	F21K5/00		385
F21K5/02	8	{ignited in a non-disrupting container, e.g. photo-flash bulb}	F21K5/08	F21K5/02		965
F21K5/023	9	{Ignition devices in photo flash bulbs}	F21K5/12	F21K5/02		473
F21K5/026	10	{using mechanical firing, e.g. percussion of a fulminating charge}	F21K5/14	F21K5/02		119
F21K9/00	7	Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers<br><br><u>NOTE</u><br><br>In this group, the following expressions are used with the meaning indicated:<br>"light source" means a light-generating component intended for installation in a fitting or holder incorporated in a lighting device;<br>"retrofit light source" means a light source comprising substantially the same attachment means as those of incandescent lamps or fluorescent lamps. "Retrofit light sources" are specially adapted for replacing or substituting such lamps.<br>Semiconductor devices per se, or assemblies thereof, specially adapted for light emission, e.g. for use in light sources (in the sense of Note (1)) are covered by subclasses H01S (e.g. H01S5/00), H10H (e.g. H10H20/00 and H10H29/20, and H10K (e.g. H10K50/00 and H10K59/00)<br>Lighting devices or systems in which light sources are used are covered by subclasses F21L or F21S.<br>When classifying in this group, classification is also made in subclass F21V if detail aspects covered by that subclass are of interest.	F21K9/00	F21K9/00		4076
F21K9/20	8	Light sources comprising attachment means	F21K9/20	F21K9/20		5345
F21K9/23	9	Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings	F21K9/23	F21K9/23		2585
F21K9/232	10	specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb	F21K9/232	F21K9/232		4585
F21K9/233	10	specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps	F21K9/233	F21K9/233		927
F21K9/235	10	Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps (F21K9/238 takes precedence)	F21K9/235	F21K9/235		1060
F21K9/237	10	Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases (F21K9/238 takes precedence)	F21K9/237	F21K9/237		1210
F21K9/238	10	Arrangement or mounting of circuit elements integrated in the light source	F21K9/238	F21K9/238		2023
F21K9/27	9	Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes	F21K9/27	F21K9/27		1809
F21K9/272	10	Details of end parts, i.e. the parts that connect the light source to a fitting; Arrangement of components within end parts (F21K9/278 takes precedence)	F21K9/272	F21K9/272		808
F21K9/275	10	Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings (F21K9/278 takes precedence)	F21K9/275	F21K9/275		676
F21K9/278	10	Arrangement or mounting of circuit elements integrated in the light source	F21K9/278	F21K9/278		832
F21K9/60	8	Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction	F21K9/60	F21K9/60		1607
F21K9/61	9	using light guides	F21K9/61	F21K9/61		1776
F21K9/62	9	using mixing chambers, e.g. housings with reflective walls	F21K9/62	F21K9/62		559
F21K9/64	9	using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer	F21K9/64	F21K9/64		2675
F21K9/65	9	specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts	F21K9/65	F21K9/65		962
F21K9/66	9	Details of globes or covers forming part of the light source	F21K9/66	F21K9/66		834
F21K9/68	9	Details of reflectors forming part of the light source	F21K9/68	F21K9/68		1813
F21K9/69	9	Details of refractors forming part of the light source	F21K9/69	F21K9/69		1935
F21K9/90	8	Methods of manufacture	F21K9/90	F21K9/90		2404
F21K99/00	7	Subject matter not provided for in other groups of this subclass	F21K99/00	F21K99/00		177
