The London 2012 Olympic Stadium now has 14 lighting towers in place, taking the venue to its full height of 60m.
Each tower, weighing 34t, was placed on the roof by a 650t crane over a three week period.
The towers will feature integrated walkways, access, power supplies, cabling and lighting.
The lighting towers house up to 44 floodlights installed in the inner tension ring of the roof structure.
Once all the towers are in place, the cable-net roof of the stadium will be erected.
The scheme is expected to be complete next year, the Olympic Delivery Authority (ODA) said.