灯泡的形状和大小 Bulb Shapes and Sizes
The code number of a bulb consists of a letter or letters followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. The mosts commonly used household bulb is the A-19. The bulb is "A" type and the diameter would be 23/8". A 65BR40 is a 65 watt reflector 5" in diameter.https://www.ledpan.com/data/attachment/forum/201602/23/143601didbf8eh4dwr2she.gif
一系列灯泡由一个字母或字母后跟一个数字组成。以下灯泡形状和数字涉及到的鳞茎的八分之七英寸的直径。最常用的家用灯泡是 A-19。灯泡是"A"型和直径，将 23/8"。65BR40 是 65 瓦反射器 5"直径。
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