| |||
preheating time; rise time | |||
warm up time | |||
warm-up period | |||
heating-up period | |||
period of warming-up; warm-up time (period); preheating time (mercury arc valve); heat time | |||
heating-up time | |||
warm-up time (e.g. of a lamp) | |||
heating time; preheat time (e.g. of the tube); preheating time (e.g. of the tube) |