Rapid-start fluorescent lamps contain electrodes (filaments) at either end of the lamp. They can be identified by bi-pin bases. These electrodes are preheated for at least one-half second. Once the electrodes are brought to the appropriate temperature, the arc is struck and the lamp produces light. Instant-start lamps have single-pin bases, so there is no opportunity for preheating the electrodes. Instead, the ballast applies roughly three times more voltage to the lamp than a rapid-start system.
This jolt of electricity can be detrimental to the life of the lamp's components, especially the electrodes. Therefore, instant-start lamps typically have a rated life of 15,000 hours versus 20,000 hours for rapid-start. These figures are based on three hours of operation per start. In the past, many lighting systems were designed on the basis of 12 or more hours of operation per start. At that rate, both lamp types approach the same life -- 29,000 hours.
Incidentally, rapid-start lamps can be operated by instant-start ballasts. In this case, the life of the rapid-start lamp is derated to 15,000 hours at three hours per start. Instant-start lamps cannot be powered by rapid-start ballasts since there is only one pin at each end of the lamp. (Preheating of the electrode requires a complete loop of electricity, hence the filament and bi-pin base.)
Typically, rapid-start lamps maintain the electrode heat during normal operation. This consumes an additional three watts of power not converted into light. Instant-start lamps do not require electrode heating. Therefore, an instant-start lamp and ballast combination can slightly reduce energy use. This is a similar technique to using a hybrid (heater cutout) ballast.
Well now, that is theory. I coldn't buy rapid starters in my country.
I will thanks to everybody who can post me electric shema of electronic balast driver for T8 lamps,
like this:
https://news.thomasnet.com/fullstory/473148