The light, now visible from as far as away, was lit one hour after the sun set and extinguished one hour before sunrise. The Russian Empire took over the administration of the lighthouse in 1810 and a major reconstruction of the tower began. A room for a team of six men was cut to the southern buttress and from there a stone staircase up to the tower. Into the upper part two subsidiary rooms were cut, one on top of the other, and a new lantern room was built on top of them. The lantern room housed twenty three oil lamps, using silver-plated brass reflectors. The lamps burned hemp oil, requiring yearly. In 1845, a crack in the upper part of the lighthouse called for extensive reconstruction, which saw part of the tower pulled down and rebuilt. The tower now gained its final height. A wooden structure with lamp-chimneys was built for the lantern and its optical devices. The lighthouse came under navy control, and the first maintenance rules were laid down. The fire was to be lit and extinguished in strict accordance to sunrise and sunset. In cloudy weather lighthouse keepers were to consult a calendar for the necessary data. At that time, the fire was kept burning nightly from 1 July to 1 May – 10 months of the year. As part of his naval reforms, Grand Duke Constantine Nikolaevich of Russia demanded modernization of the Kõpu Lighthouse, in 1859. In May 1860, a novel rotating lantern (manufactured by Le Paute in Paris) was installed. It rotated at a speed of one revolution per four minutes, using a clockwork pulley-weight system. The device had one Carsel lamp with four concentric light sources and a Fresnel lens. The lamp consumed of rapeseed oil hourly, and the fuel pump was powered by the same clockwork mechanism. It was said to be visible up to away. A team of seven serviced the lighthouse, with one required to be near the light at all times. The buttress with the staircase was roofed with wooden boards and tin sheets in 1869. A telegraph installation and rescue stations were established near the lighthouse in the same year; the first-established worked until 1898 when it was replaced by a telephone. Twentieth century A new light system was bought at the 1900 Paris World Fair, for three million gold rubles. The new apparatus (including the light