1.3. Lamp beads parameters
To this end, we chose to adopt the following two kinds of red and blue LED lamp beads (Fig. 1).
Fig. 1
Fig. 1.
The spectrum diagram of the two kinds of supplementary lighting systems (a) red and blue ratio is 4:1 (b) red and blue ratio is 9:1 (for interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).