hellblau
light blue
The color of a clear daytime sky; a bright, pale shade of blue.
Sie trug ein hellblaues Kleid, das perfekt zu ihren Augen passte.
She wore a light blue dress that matched her eyes perfectly.

light blue
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light blue
The color of a clear daytime sky; a bright, pale shade of blue.
Sie trug ein hellblaues Kleid, das perfekt zu ihren Augen passte.
She wore a light blue dress that matched her eyes perfectly.

'Hellblau' (light blue) is made up of 'hell' (light) and 'blau' (blue). This pattern works with many colors to describe a lighter variant, for example 'hellgrün' (light green) or 'hellrot' (light red).
Für das Babyzimmer haben wir eine hellgrüne Farbe gewählt.
We chose a light green color for the baby's room.
When 'hellblau' (light blue) comes before a noun, it is declined. When it comes after verbs like 'sein' (to be), it remains unchanged.
Er fährt ein hellblaues Fahrrad.
He rides a light blue bicycle.
The color 'hellblau' (light blue) is often used to describe the sky, water, or a person's eyes.
An einem sonnigen Tag ist der Himmel oft strahlend hellblau.
On a sunny day, the sky is often a radiant light blue.
blue
'blau' and 'hellblau' belong to the same color family. 'Blau' is the general name for the color and does not yet say whether the shade is light or dark. 'Hellblau' is more specific and means a light, often friendly shade of blue, like a clear sky. Learners may confuse the words because light blue is, of course, also blue. If the exact shade is not important, 'blau' is enough. If you want to emphasize the light shade or distinguish something from dark blue, 'hellblau' is more suitable.

Für das Kinderzimmer wählt Lisa eine hellblaue Wandfarbe.
Lisa chooses a light blue wall color for the children's room.
Beim Einkaufen habe ich eine blaue Jacke gefunden.
While shopping, I found a blue jacket.