- Shape / Size
All sizes depicted in product diagrams are in millimeters. Assume normal error tolerance for items with no allowance for error displayed.
The shape of the filament depicted in these diagrams is an example only. For the actual filament shape for each lamp, refer to the diagram in the "Filament Shape" field, and the "Filament Shape" field in the lamp’s standards table.
- Design Voltage
"Design Voltage" denotes the voltage needed to obtain the rated current, brightness, and average lifespan of the lamp.
- Design Current
"Design Current" denotes the electric current that will flow through the lamp when the design voltage is applied to it. Except in the case of special items, there is generally a plus / minus 10 percent tolerance allowance in figures displayed for current values. Oshino also accepts requests for selections with smaller error tolerances.
- Brightness (MSCP)
Generally, to indicate the brightness of subminiature lamps, the unit MSCP(Mean Spherical Candela Power) is used.
MSCP is a total amount of luminous flux emitted from a lamp that is placed at the center of a standardised sphere. The values are dependant upon comparative measurement to officially recognised standard lamps. Oshino Lamps Ltd. has the standard lamps comparatively calibrated to NIST(Formerly, NBS)-conforming standard lamps.MSCP values can be converted into Lumen by the following formula.
*MSCP × 4π = Lm - Selection Parameters
All Oshino sub-miniature lamps are subjected to selection for aging, current, and brightness. The selection parameter field values display brightness (MSCP) tolerances. Although tolerances of ± 25 percent are applied by default, items with ±10% or ±15% tolerances are identified by the addition of "AS10" or "AS15" to the lamp number.
The "AS" nomenclature is taken from the first letters of "Aging" and "Selection".
Please contact us if you would like to order low-tolerance versions of lamps which do not have an AS10 or AS15 designation in the standards table.
- Filament Shape
In some cases, filament supports are used to improve the lifespan, shock resistance, and reliability of a lamp filament. Refer to the "Filament Shape" field, and the following diagram for the individual filament shapes of each lamp. "C" refers to a single coil, and "CC" to a double coil. Oshino reserves the right to make changes to filaments without warning to improve performance.
- Average Lifespan
The time in the "Life" field denotes the average lifespan of the lamp under strictly controlled conditions; i.e. where the lamp is used continuously under conditions of less than ±1 percent change in voltage, at a fixed room temperature, with no shock nor vibration.
Vibration, fluctuations in voltage that exceed defined limits, and other unfavorable conditions can significantly reduce the lifespan of a lamp. Oshino calculates the average lifespan by averaging the time taken to reach the point at which more than 50 percent of the test material is severed. Except in special cases, the time depicted is for use of the lamp with alternating current. When direct current is used, the lifespan may be reduced approximately 50 percent or less of the time depicted.
Since sub-miniature lamps are generally long-lived, an accelerated lifespan test which employs over-voltage is often used to evaluate their lifespan. The theoretical life span is calculated using a theoretical formula that multiplies the inverse of the forced voltage to the twelfth power by a coefficient (based on the bulb diameter, filament design, and filament material).
This figure is not a guarantee of lifespan, but a reference figure which may change without notice.
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