These bulbs came from some integrated science experiment kits for primary education in around 2001 to 2003, having a rating of 1.5V 300mA.
These bulbs have a very thin filament so their brightness is quite low, might burn out if the supply voltage exceeds 2.5 volts. In this video the bulbs are tested with one 1.5 volts alkaline cell.
Негізгі бет E9 1.5V clear spherical incandescent bulbs
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