This is the 6296th most frequent Russian word.
усиленный
Enhanced; reinforced; intensified.
Here, 'усиленный' describes the mode of learning, indicating it is enhanced or intensified.
Он получил усиленный режим обучения в школе.
He received an intensified mode of learning at school.
In this case, 'усиленная' qualifies the structure, giving the meaning that it has been strengthened for stability.
Для этой задачи была использована усиленная конструкция.
A reinforced structure was used for this task.
Here, 'усиленный' modifies the lighting option, implying that it provides stronger illumination.