LED tubes based on Retro-Fit design can typically be installed in place of former fluorescent tubes in compatible luminaires as they are, with consideration of manufacturer and lamp-specific restrictions. Some models are only compatible with magnetic ballasts, but models that can be installed in any old fluorescent tube luminaire are also available on the market. In some Retro-Fit LED tubes, a special LED starter is used in place of the fluorescent lamp starter. Re-introduction of fluorescent lamps is still possible merely by lamp and starter replacement. If used in luminaires equipped with compensation capacitors, LED tubes often generate a lot of reactive power. Most LED tubes based on Retro-Fit design are manufactured according to the LED tube standard EN62776.