Full figure (27 kB)Fig. 1. (a) The completed diode light mixer. The inset at the bottom of the photo shows the back view of the light mixer with LEDs switched on; the arrow points to the slit, which is used in the experiment with light shadows. (b) Electronic circuit of the diode light mixer; the suggested resistor values refer to the LEDs specified in the references. First citation in article
Full figure (24 kB)Fig. 2. Combining red (R), green (G), and blue (B) lights with the ball light mixer, white (W), cyan (C), magenta (M), and yellow (Y) color can be produced. First citation in article
Full figure (32 kB)Fig. 3. The color patterns are produced when (a) a wire or (b) a paper strip is inserted all the way through the ball and (c) when a paper strip is inserted about half the way through the ball (the sketches below show the situation in the central cross section of the photos above). The colors on the sketches are indicated with the usual letters (K means black). First citation in article
Full figure (27 kB)Fig. 4. Red-green yellow ball (on the left) and "proper" yellow ball (on the right) as seen under different conditions: (a) with no added filter, and when observed through the following filters: (b) red filter, (c) magenta filter, (d) green filter, (e) orange filter, and (f) green and orange filter together. The photos from (a) to (e) were obtained with exposure time of 1/6 s and aperture 8, while (f) was obtained with the exposure time of 4 s and aperture 8. First citation in article
Full figure (19 kB)Fig. 5. (a)–(b) the spectra of white and yellow glowing RGB light mixer and (c) the spectrum of yellow LED. The scale shows the wavelength in nm. First citation in article