El haz de luz parece fuerte.

Here haz is a noun, not a verb. It means beam or ray, so el haz de luz means the beam of light.

It happens to be spelled the same as haz, the tú imperative of hacer (do / make), but in this sentence it is clearly a noun because it comes after el.

• el haz de luz = the beam of light
• haz la tarea = do the homework

Same spelling, different grammar and meaning.

Because haz in this meaning is a masculine noun: el haz.

This can feel surprising because learners often try to guess gender from the ending, but noun gender in Spanish is not always predictable just from the last letter. Even though haz ends in -z, it is masculine in this meaning.

So:

• el haz de luz
• un haz de luz

Spanish often uses noun + de + noun where English uses noun + noun.

So:

• haz de luz = literally beam of light
• not usually luz haz or anything similar

This de links the two nouns and tells you what kind of beam it is.

Other common examples:

• una taza de té = a cup of tea
• una botella de agua = a bottle of water
• una fuente de energía = a source of energy

Parece is the third-person singular form of parecer, meaning to seem.

The subject is el haz de luz, which is singular, so the verb must also be singular:

• el haz de luz parece
• not parecen

A quick breakdown:

• yo parezco
• tú pareces
• él / ella / usted parece

Here, el haz de luz works like it, so it seems strong = parece fuerte.

Because parecer expresses appearance or impression, not a definite fact.

• parece fuerte = it seems strong
• es fuerte = it is strong
• está fuerte = usually it is in a strong condition or, with people, well-built / strong

So parece fuerte suggests that this is how it looks or comes across, without fully stating it as an objective fact.

That makes parecer a very natural choice here.

Because fuerte is the correct adjective form. Spanish adjectives do not all follow the -o / -a pattern.

Fuerte is one of many adjectives that have the same form for masculine and feminine singular:

• el haz es fuerte
• la luz es fuerte

Plural changes normally add -s:

• los haces son fuertes
• las luces son fuertes

So fuerte does agree in number, but not with different masculine/feminine singular forms.

Literally, fuerte means strong. But in context, especially with light, it can often be understood as:

• strong
• intense
• sometimes close to bright

A beam of light being fuerte usually means it has a lot of intensity or power.

So while the literal translation is strong, the natural interpretation depends on context.

Because haz de luz is a set expression meaning beam of light in a general descriptive sense.

• un haz de luz
• el haz de luz

If you say el haz de la luz, that usually sounds more specific, as if you mean the beam from the light or the beam of that particular light source. In many contexts, that would sound less natural.

So in this sentence, haz de luz is the normal phrasing.

In standard Spain Spanish, z is pronounced like the th in think, so haz sounds approximately like ath.

Very roughly:

• haz ≈ ath
• luz ≈ looth

In much of Latin America, z is pronounced like s, so haz would sound more like as.

Since you asked about Spanish from Spain, the Spain pronunciation is the one to focus on.

Yes, Spanish word order is more flexible than English, but the neutral, most straightforward order here is:

• El haz de luz parece fuerte.

You can say:

• Parece fuerte el haz de luz.

That version is grammatically possible, but it sounds more marked or stylistic, and it may put more attention on parece fuerte first.

For a learner, the original order is the safest and most natural default.

Yes. The plural of haz is haces.

So:

• el haz = the beam
• los haces = the beams

Example:

• Los haces de luz parecen fuertes.

Notice:

• haz → haces
• parece → parecen
• fuerte → fuertes

Everything has to agree properly in plural.

Yes, it is grammatical and natural. It sounds slightly descriptive or literary, but it is perfectly normal Spanish.

Depending on context, native speakers might also say things like:

• El rayo de luz parece fuerte.
• La luz parece intensa.
• Ese haz de luz es muy fuerte.

But El haz de luz parece fuerte is absolutely fine and understandable.

Yes. That is a very common structure in Spanish:

• parecer + adjective
• parecer + noun
• parecer + infinitive / clause, in other contexts

So:

• parece fuerte = seems strong
• parece difícil = seems difficult
• parece imposible = seems impossible

This is one of the most useful patterns to learn with parecer.