hellbraun
light brown
Describes the color of a pale, light shade of brown.
Er hat hellbraune Augen und dunkle Haare.
He has light brown eyes and dark hair.

light brown
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light brown
Describes the color of a pale, light shade of brown.
Er hat hellbraune Augen und dunkle Haare.
He has light brown eyes and dark hair.

'Hellbraun' is made up of the words 'hell' (light) and 'braun' (brown). This pattern is very common with colors in order to describe shades, e.g. dunkelgrün (dark green), hellblau (light blue), tiefrot (deep red).
Für das Wohnzimmer haben wir uns für ein hellbraunes Sofa entschieden.
For the living room, we chose a light brown sofa.
Like other adjectives, 'hellbraun' is declined when it stands before a noun. But if it stands after the noun as part of the predicate, it remains unchanged.
Er trägt einen hellbraunen Mantel.
He is wearing a light brown coat.
'Hellbraun' is often used to describe the color of hair, eyes, wood, leather, or clothing.
Die neuen Stiefel sind aus hellbraunem Leder gefertigt.
The new boots are made of light brown leather.
brown
'braun' and 'hellbraun' both belong to the same color range. 'braun' is general and can be light, medium, or dark. 'hellbraun' is more specific and describes a pale, not very dark brown. Learners may confuse the words because light brown is also a type of brown. If the exact color does not matter, you simply say 'braun'. If you mean a lighter shade, for example with hair, shoes, or a table, 'hellbraun' sounds more natural and more precise.

Am Morgen wählt der Mitarbeiter die hellbraune Tasche für den Termin.
In the morning, the employee chooses the light brown bag for the appointment.
Der Hund hat ein braunes Fell und weiße Pfoten.
The dog has brown fur and white paws.