Bright

färggrann

(of a colour: not muted or pale — see also bold, vivid)

glad

(in good spirits — see also happy, optimistic)

intelligent

(having a clear, quick intellect — see also intelligent)

klar

(of a colour: not muted or pale — see also bold, vivid)

klyftig

(having a clear, quick intellect — see also intelligent)

ljus

(emitting much light; visually dazzling — see also luminous, radiant)