Breakdown of При чтении текста тебе нужно пользоваться естественным освещением.
ты
you (singular)
текст
text
нужно
it is necessary
пользоваться
to use
Questions & Answers about При чтении текста тебе нужно пользоваться естественным освещением.
Why do we use при чтении here instead of a clause with когда (when)?
Both are correct, but using при plus the Prepositional case of a verbal noun like чтение (reading) is a very common way to express 'in the process of' or 'during'. It sounds slightly more concise and slightly more formal than a full когда ты читаешь (when you read) clause.
Why is the word for text in the Genitive case (текста)?
Because it immediately follows the noun чтении. When a noun acts as the object of a verbal noun, translating roughly as 'the reading of a text', it takes the Genitive case to show that relationship.
Why is 'natural lighting' in the Instrumental case (естественным освещением)?
The verb пользоваться (to use) always requires its object to be in the Instrumental case. Even though we think of it as a direct object in English, this specific verb demands the Instrumental in Russian.
Why use the imperfective verb пользоваться instead of the perfective воспользоваться?
The sentence gives general, continuous advice for whenever you are reading, rather than an instruction for one specific, isolated event. Habitual or ongoing actions require the imperfective aspect.