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Lighting from Construction to 1985
Initially, the Eiffel Tower was lighted by gas, having some 10,000 gas street lamps lighting the tower and platforms. This was upgraded to electrical lighting, using 3,200 lamps, for the Universal Exposition of 1900. Since then, the tower's lighting has been enhanced periodically. In 1925, André Citroën lighted up the tower, using 250,000 colored lights, with a boldly lighted advertisement for his company spelling out the word "Citroën". In 1937, for the International Exposition of Arts and Techniques, André Granet added colored lighting to the tower. 252 Yellow-orange sodium tinted lamps were installed in 1985.

In 1975 a revolving beacon replaced the fixed navigational red light at the summit. Subsequently, in 1986, 2 light beacons were installed that are capable of being seen 80 km away. The beacons are activated when the tower is lighted up at night.
The beacons consist of 4 marine-type, motorized light projectors which are computer controlled. 6000 watt Xenon lamps, that have a 1200 hour light expectance, are used. The lamps are integrated with a temperature controlled heating and cooling system; heating is automatically activated when the ambient temperature drops below zero degrees centigrade.

Lighting from 1986 to Present

During 1986 a new, two tiered, lighting system was installed to provide both normal and 'sparkle' lighting.  The new system consists of some 20,000 special light bulbs covering the whole of the tower; that's 5,000 per side [in case you're wondering, they weigh a total of 8 tons].  The system has 230 enclosed lighting fixtures and electrical boxes, networking 800 strings of lights measuring 18 km long.  The new lighting installation required 25 mountain climbers who worked for 5 months to set up the system.
 

For 5 days, commencing January 24, 2004, the tower was lighted all night in scarlet red to celebrate the

controversy over photographing the tower at night [see copyright below].
 

                                         The Elevators

The builders of the Eiffel Tower were challenged by the technical questions raised by the installation of the elevators. First of all, there was no experience relating to the installation of elevators climbing to such heights while carrying the required loads. Secondly, there were the further complexities introduced by the slanting tracks to be negotiated at the various angles. The first elevators were installed in May, 1889; all were operational by the following June 16th. Over the years, the elevators have traveled about 100,000 km per annum.

From the Ground Level to the 2nd Level

The original hydraulically powered elevators, in the east and west piers, were replaced in 1897 and 1899 with elevators from another company that had 16-meter long main pistons and hydraulic accumulators. These were used into the 1980s.

The elevators in the north and south piers were scrapped in 1900 and 1912 respectively. The replacements were used until upgraded, in 1995, with new cabins and computer controls.

In 1983, a new customer elevator was installed to take customers up to the Jules Verne Restaurant; it was

augmented by a service elevator that was fitted out in 1989.

Elevator to  2nd Level

The elevators can move both up and down at two different angles to match the angles of the tower's legs. The double decked elevators in the north, east, and west piers are generally comparable; the one in the south pier is used to take Jules Verne customers from the ground level up to the restaurant itself. This pier also contains the stairway between the ground and second levels.