Bright

alegre

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

brilante

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

brillante

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

coruscante

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

curusqueiro

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

lucidío

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

radiante

(in good spirits — see also happy, optimistic)