Hola Bilice,

Tras haber hecho una búsqueda, es posible que sí tenga que ver. Creo que son bombillas fluorescentes específicas para máquinas expendedoras (y para "appliance", que son electrodomésticos). Te paso un par de referencias:

"F18T8 bulbs were the original fluorescent vending machine light tubes, which are known as T8 bulbs." (...) "As mentioned before, F18T8 fluorescent light bulbs have been used in many types of lighting that includes some things that are a little more obscure. A real popular application is vending machines or other types of machinery which require a specific size light to illuminate a certain area. These could be special types of industrial machines or task lights, but mostly it's for illuminating areas which are usually tight it are hard to reach."

<http://www.elightbulbs.com/library/f18t8_fluorescent_light_b...



<http://www.ehow.co.uk/how_7636261_replace-fluorescent-bulbs-...