F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCELIGHT SOURCES USING ELECTROCHEMILUMINESCENCELIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIALLIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTSLIGHT SOURCES NOT OTHERWISE PROVIDED FORIn this subclass, it is desirable to add the indexing codes of subclasses F21W and F21Y.The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups: F21K5/04 covered by G03B15/0457;F21K5/06 covered by G03B15/0442;F21K5/08 covered by F21K5/02, G03B15/0442;F21K5/10 covered by G03B15/0442;F21K5/12 covered by F21K5/023;F21K5/14 covered by F21K5/026, G03B15/0489;F21K5/16 covered by G03B15/0452;F21K5/18 covered by G03B15/0452;F21K5/20 covered by G03B15/0447;F21K5/22 covered by G03B15/0442. F21K2/00 F21K2/00Non-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 H01J65/04Light sources using electrochemiluminescence F21K2/005excited by infra-red radiation using up-conversion F21K2/04using triboluminescenceusing thermoluminescence F21K2/06using chemiluminescence F21K2/08activated by an electric field, i.e. electrochemiluminescence F21K5/00Light sources using charges of combustible material, e.g. illuminating flash devices F21K5/02ignited in a non-disrupting container, e.g. photo-flash bulb F21K5/023Ignition devices in photo flash bulbs F21K5/026using mechanical firing, e.g. percussion of a fulminating charge F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasersIn this group, the following expressions are used with the meaning indicated:"light source" means a light-generating component intended for installation in a fitting or holder incorporated in a lighting device;"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.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 H01L (e.g. H01L33/00), H01S (e.g. H01S5/00) or class H10 and subclass H10K (e.g. H10K50/00 and H10K59/00)Lighting devices or systems in which light sources are used are covered by subclasses F21L or F21S.When classifying in this group, classification is also made in subclass F21V if detail aspects covered by that subclass are of interest. F21K9/20Light sources comprising attachment means F21K9/23Retrofit 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 F21K9/232specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb F21K9/233specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps F21K9/235Details of bases or caps, i.e. the parts that connect the light source to a fittingArrangement of components within bases or caps F21K9/238 takes precedence F21K9/237Details of housings or cases, i.e. the parts between the light-generating element and the basesArrangement of components within housings or cases F21K9/238 takes precedence F21K9/238Arrangement or mounting of circuit elements integrated in the light source F21K9/27Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes F21K9/272Details of end parts, i.e. the parts that connect the light source to a fittingArrangement of components within end parts F21K9/278 takes precedence F21K9/275Details of bases or housings, i.e. the parts between the light-generating element and the end capsArrangement of components within bases or housings F21K9/278 takes precedence F21K9/278Arrangement or mounting of circuit elements integrated in the light source F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction F21K9/61using light guides F21K9/62using mixing chambers, e.g. housings with reflective walls F21K9/64using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer F21K9/65specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts F21K9/66Details of globes or covers forming part of the light source F21K9/68Details of reflectors forming part of the light source F21K9/69Details of refractors forming part of the light source F21K9/90Methods of manufacture F21K99/00Subject matter not provided for in other groups of this subclass F21K2099/005Other light sources comprising light emitting diodes associated with conversion means