## 5 Discussion  
From [PERSON]'s second law of additive mixing, two green LEDs are placed to improve the CRI property of DL. Still, the eye perceives identical colors due to metamerism. Green color enhances the CRI as human scotopic vision is defined for predominantly green regions. Figure 1a shows that most down-converted photons of individual slides are surrounded near the peak-emission wavelength of their respective activator cations. However, in multi-layered structures, the spectrum in Figure 1b is not flat compared to sunlight (visible regions) due to thermal and PL quenching. A designed lamp attempts to solve the problem of PL quenching and limited optical bandwidth is fabricated to perform spectral addition of seven LEDs using reflector and diffuser assembly, yielding a resultant broadband spectrum whose average CRI, CCT, and CIE are 90, 5114 K, and (0.33, 0.33). The DL shows 16% increased CRI with 120 degrees of angular uniformity than conventional WL (CRI 78 in this experiment) and near-perfect sunlike coordinates, which are rounded to two decimal places (0.33, 0.33), as shown in Figure 3a. Light mixing inside light reflectors can be assumed to follow the central limit theorem, which says that if many independent random processes with arbitrary probability distribution functions are added, the sum approaches Gaussian distribution. This lamp achieved a maximum CRI of 95.5 in the 1-2 A range of current, but from an eye safety and thermal safety points of view, we chose to record all the data at low current. However, in our present system, we have used multiple blue chip LEDs (surface mount device, SMD), with a color phosphor mounted on top of each one. Since we have mounted these chips in the side-by-side planar configuration, there are negligible chances of reabsorption. Absorption of phosphors requires a wavelength of 450 nm or below. The downconverted set of wavelengths from each LED possess fewer residual blue (pump) photons; hence, we can say that neighboring phosphors are less likely to re-absorb. Figure 12: Autocorrelation of the received long PRBS (\(2^{11}-1\)) signal using WL and DL as sources of information. Here, the resolution bandwidth of DL is more than that of WL. Narrow pulsed DL shows a faster impulse response than conventional white light. Four methods are shown to analyze signal integrity: first, the signal-eye diagram, jitter analysis, and PSD (FFT and autocorrelation function). From Equation (11), it is clear that the more LEDs there are, the more interference there will be. Still, Gaussian noise (from DL) is better than a single noise source (WL), as the error probability of unipolar NRZ signal is inversely proportional to noise. Figure 11 shows that a data transfer rate of 2 kbps corresponds to the first null of frequency spectrum at 2 kHz and a null-to-null bandwidth of 4 kHz. In Figure 12, we observed the autocorrelation of the received PRBS signal to confirm the bandwidth increment using DL. The authors introduced a high CRI light source for visible light communications in the proposed work. The slew rate transforms amplitude error to phase error (jitter). The designed lamp shows a fast communication response and enhanced color quality parameters. It is worth noting that DL is more suitable for low-loss transmission of a test signal than WL. We compared the communication characteristics without using a spectrum analyzer and an arbitrary waveform generator. Jitter analysis is imperative from a cyber-security point of view as a deterministic jitter component can be used to guess the transmitted pattern. A 31% decrease in rise time was observed for DL, as shown in Table 1. The total jitter content of DL is 39% less than that of WL as an information source, but the RJ component is high as we have modulated seven LEDs together; hence, color crosstalk may occur. It is important to note that the Q-factor increases when DL transmits a signal. Crosstalk can be mitigated by positioning free-form optics before the detector [65].