The operating voltage of the lamp.
In different types of equipment, the voltage of on-board networks is also different. Therefore,
car lamps for passenger cars are designed for a voltage of 12 V, and
car lamps for trucks(and other similar equipment, such as buses) are designed for 24 V. However, there are more specific options:
—
12/24 V. Lamps with the possibility of using in both types of on-board networks — both cars and trucks. Such versatility is found mainly among LED models, as well as in some varieties of xenon (see "Type"): these types of lamps are equipped with control circuits in which automatic adjustment to the voltage of the on-board network can be provided.
— 85 V. Value found in models with a xenon principle of operation (see "Type"). In this case, it means the voltage supplied to the lamp from the ignition unit (see below); the ignition unit itself is connected to the on-board network and is usually designed for 12 V. Data on the operating voltage of the lamp itself may be needed if you need to separately select the ignition unit for it.
— 40 V. Another option for increased voltage in xenon lamps; the meaning is completely similar to the 85 V described above, but it is much less common.
The angle of illumination provided by the LED car lamp (see “Type”). This parameter, as a rule, is selected by the manufacturer taking into account the purpose (see above) and other features of the lamp’s use.
Models for headlights (see “Purpose”) usually have fairly large coverage angles - from
270° to
360°(the latter cover almost the entire sphere, with the exception of the space behind the base). This is necessary to work effectively with headlight reflectors. Theoretically, the larger the illumination angle, the more efficiently the reflector area is used and the higher the actual brightness; however, in practice this difference is not so noticeable, and much depends on the specific configuration of the reflectors. A specific type of LED headlight lamps are models with an illumination angle of about 60°, in which the concentration of the light beam is ensured by the built-in reflectors of the lamp itself.
In turn, in auxiliary lighting, the angles are selected for the specific specialization of the lamp and are usually at least
120°(maximum - the same 360°).
