Bohlam di kamar adik perempuan saya mati tadi malam.

Indonesian usually does not use articles like the, a, or an.

So:

• bohlam can mean a bulb, the bulb, or just bulb
• the exact meaning depends on context

In this sentence, context makes it natural to understand bohlam as the light bulb.

Bohlam specifically means light bulb.

Lampu is a broader word and can mean:

• lamp
• light
• sometimes light fixture

So:

• bohlam mati = the bulb is dead / burned out
• lampu mati can mean the light is off, the lamp is out, or even the electricity is out, depending on context

Using bohlam here is more specific.

Di is a preposition meaning in, at, or on for location.

So:

• di kamar = in the room

In the sentence:

• Bohlam di kamar adik perempuan saya = The bulb in my younger sister’s room

A very important point:
di as a preposition is written separately from the following word.

• di kamar = correct
• not dikamar

Adik means younger sibling.
So it already tells you the sibling is younger.

Because adik by itself does not always specify gender, Indonesian often adds:

• adik perempuan = younger sister
• adik laki-laki = younger brother

By contrast, saudara perempuan means female sibling / sister in a more general or formal sense, but it does not tell you whether she is older or younger.

So:

• adik perempuan saya = my younger sister
• saudara perempuan saya = my sister (more formal, less specific about age)

In Indonesian, possessive words usually come after the noun.

So:

• adik perempuan saya = my younger sister
• literally: younger sister my

This is normal Indonesian word order.

Other examples:

• buku saya = my book
• rumah mereka = their house
• mobil John = John’s car

So the possessor follows the thing possessed.

Yes, mati literally means dead, but in Indonesian it is also commonly used for things that stop functioning, stop burning, or go out.

So bohlam ... mati can mean:

• the bulb died
• the bulb went out
• the bulb burned out
• the bulb is not working

This is very natural in Indonesian.

You will also hear:

• lampu mati = the light is off / out
• mesin mati = the engine died / stopped
• HP saya mati = my phone died

So mati is much broader than English dead.

No. Indonesian often does not need a verb like is, am, are, was, or were in sentences like this.

The sentence works as:

• Bohlam di kamar adik perempuan saya = subject
• mati = predicate/state
• tadi malam = time expression

So Indonesian can say directly:

• Bohlam ... mati
  without adding a word for was.

This is very common in Indonesian.

Tadi malam means last night.

Breakdown:

• tadi often refers to something that happened earlier today or a short time ago
• but in the expression tadi malam, it means last night

Other common time expressions:

• tadi pagi = this morning / earlier this morning
• tadi siang = earlier this afternoon
• kemarin malam = also last night, depending on context

In this sentence, tadi malam tells you when the bulb died.

Yes, Indonesian often puts time expressions at the end, but they can also appear earlier.

This sentence:

• Bohlam di kamar adik perempuan saya mati tadi malam.

is very natural.

You could also say:

• Tadi malam, bohlam di kamar adik perempuan saya mati.

That also sounds natural and puts more focus on the time.

So the end position is common, but Indonesian word order is fairly flexible for time expressions.

A helpful way to break it down is:

• Bohlam = bulb
• di kamar adik perempuan saya = in my younger sister’s room
• mati = died / went out / burned out
• tadi malam = last night

So the overall structure is:

• [Subject]: Bohlam di kamar adik perempuan saya
• [Predicate]: mati
• [Time]: tadi malam

Literal order:

• Bulb in room younger sister my died last night

Natural English:

• The light bulb in my younger sister’s room went out last night.

Yes, if the listener already knows the sibling is female, or if gender is not important.

• adik saya = my younger sibling or my younger brother/sister, depending on context
• adik perempuan saya = specifically my younger sister

So adding perempuan makes the meaning clearer.

In many real conversations, Indonesians often omit the gender word if it is already understood.

By itself, mati can cover several ideas:

• off
• out
• dead
• not functioning
• burned out

With bohlam, many learners will naturally interpret it as burned out or stopped working, because a bulb itself usually does not simply turn off on its own; a bulb that mati often suggests it has failed.

But context matters. Indonesian can leave that slightly open unless more detail is added.