To develop a current plant lighting source with both a suitable
illumination area and high illumination uniformity, we propose a
lighting system for plant growth based on the combination of laser
diode and LED lighting modes. We added a triangular-prism-shaped base
plate element to the previous array type optical structure to increase
the light coupling degree and expand the illumination area. The
Taguchi method was used in our design and experiment, and the
influence of different factors on the illumination uniformity was
studied and compared to the lighting effect of a traditional array
floor structure. Finally, a plant lighting source with an illumination
uniformity of 88.54% and color-mixing uniformity of 84.75% was
obtained. Compared to the commonly adopted array structure, this plant
lighting source expands the illumination area by 31.03%, which
verifies the effectiveness of the scheme.