Abstract: An illuminating device comprises a light source, a lens holder, and a spherical modulator. The lens holder has a concave part and a blocking part surrounding the concave part. The concave part has an aperture on the bottom. The spherical modulator contains materials having refractive indexes ranging from 1.3 to 2.7. The lens holder is located between the light source and the spherical modulator. The spherical modulator is disposed on the concave part of the lens holder and covers the aperture. The light source provides light towards the aperture. The light source and the aperture are aligned to an optical axis of the spherical modulator.