Prilagodite osvjetljenje tako što koristite prirodno svjetlo.

Because prilagodite is the 2nd person plural imperative of prilagoditi, meaning adjust / adapt.

In Croatian, this form is used for:

• you all: telling more than one person to do something
• formal you: speaking politely to one person

So Prilagodite osvjetljenje means:

• Adjust the lighting (to several people), or
• Adjust the lighting (to one person, politely)

This is very common in instructions, manuals, and polite advice.

In this sentence, it is understood as an imperative because of the context: it is giving an instruction.

Formally, prilagodite can also match a present-tense form in other contexts, but here the meaning is clearly:

• Adjust ...

So the whole sentence reads like an instruction or recommendation.

Croatian usually does not need subject pronouns when the verb ending already shows who the subject is.

Here, prilagodite already tells you the subject is:

• you (plural) or
• you (formal singular)

So adding vi would usually be unnecessary unless you want emphasis:

• Vi prilagodite osvjetljenje... = You adjust the lighting...
  This sounds more emphatic or contrastive.

Osvjetljenje means lighting or illumination.

In this sentence, it refers to the lighting conditions in a room or scene, not to a lamp itself.

So:

• Prilagodite osvjetljenje = Adjust the lighting

A learner might compare it with:

• svjetlo = light
• osvjetljenje = lighting / illumination

So prirodno svjetlo is the actual natural light, while osvjetljenje is the overall lighting setup.

Tako što means by, by doing, or more literally in such a way that.

So:

• Prilagodite osvjetljenje tako što koristite prirodno svjetlo.
• Adjust the lighting by using natural light.

This structure is used to explain how something is done.

A useful pattern is:

• učinite nešto tako što + present tense
• do something by + verb-ing

Examples:

• Uštedite novac tako što kupujete na sniženju.
  Save money by shopping during sales.
• Poboljšajte izgovor tako što više slušate hrvatski.
  Improve your pronunciation by listening to more Croatian.

Because after tako što, Croatian normally uses a present-tense verb.

So:

• koristite = you use / you are using

But in this structure, the natural English translation is:

• by using

So even though Croatian uses a present-tense form, English often uses by + -ing.

That is why:

• tako što koristite prirodno svjetlo becomes
• by using natural light

Yes. Koristite is also a 2nd person plural form, so it matches the same you as prilagodite.

So the sentence is consistent throughout:

• Prilagodite ...
• ... tako što koristite ...

It is still addressing:

• you all, or
• you politely

Because koristiti takes a direct object, and that object is in the accusative case.

Here the object is:

• prirodno svjetlo = natural light

For neuter singular nouns like svjetlo, the nominative and accusative forms are the same:

• nominative: prirodno svjetlo
• accusative: prirodno svjetlo

So the form does not change visibly.

By contrast, prirodnim svjetlom is instrumental, meaning something more like:

• with natural light

Croatian could use instrumental in some structures, but not after koristiti, because koristiti normally takes a direct object.

It is in the accusative singular, because it is the direct object of prilagodite.

However, just like svjetlo, osvjetljenje is a neuter singular noun, and its nominative and accusative forms look the same:

• nominative: osvjetljenje
• accusative: osvjetljenje

So you know the case from the sentence structure, not from a visible ending change.

Yes, prirodno svjetlo is the normal and natural phrase for natural light.

It is made of:

• prirodno = natural (neuter singular form of the adjective)
• svjetlo = light

Because svjetlo is a neuter noun, the adjective must also be in the neuter form:

• prirodan (masculine)
• prirodna (feminine)
• prirodno (neuter)

Yes. Croatian has a few natural alternatives, for example:

• Prilagodite osvjetljenje koristeći prirodno svjetlo.
  Adjust the lighting using natural light.

• Prilagodite osvjetljenje uz pomoć prirodnog svjetla.
  Adjust the lighting with the help of natural light.

• Iskoristite prirodno svjetlo za bolje osvjetljenje.
  Use natural light for better lighting.

The original sentence with tako što is perfectly correct and clear, especially in instructional language. It explicitly explains the method.

It sounds neutral, polite, and instructional.

Because of Prilagodite and koristite, it is suitable for:

• instructions in guides
• photography or design advice
• customer-facing text
• formal or polite recommendations

If you were speaking casually to one friend, you would usually use the singular informal imperative:

• Prilagodi osvjetljenje tako što koristiš prirodno svjetlo.

So the original sounds more like a general instruction or polite advice than casual speech to one close friend.