Definition Of Terms Lamp Number
The lamp number indicated on the following pages has no technical significance.
The Bases Available
Bases available on lamps are indicated by the following page.
Design volts indicate the voltage at which lamps are designed for rated ampere, MSCP, and laboratory-life characteristics.
Design amperes designate the flow of current through a lamp operated at its design voltage. Except in special cases, it is usually allowed ± 10% of tolerance.
Mean Spherical Candle Power (MSCP)
The MSCP is the generally accepted method used indicate the brightness of miniature lamps; it is the total value emitted from a lamp placed in the center of a circle having a specified diameter The standard lamp calibrated by the National Bureau of Standards is used in determining this value. MSCP can be converted into lumens by multiplying MSCP by 4π (12.57).
Average Laboratory Life
Lifetime indicated is based upon test data recorded under strictly controlled laboratory conditions. Under normal operating conditions, however lifetime may be shorter due to factors such as voltage fluctuation, shock, vibration, temperature, and other environmental and operational conditions.
Filament type are indicated by the following page. These are classified according to diameter, length, and configuration.