Cyan is the missing spectrum in blue-based diodes, but UV-based white phosphors have higher levels of it, and that's part of the reason we used them in the High Light boards, to fill in the gaps and extend the spectrum into the near-UV/UVA range.
Here's a comparison of typical blue pump LEDs compared to Nichia's Optisolis (420nm pump) from their spec sheet (Optisolis 5000K spectrum in red):
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Here's a Seoul Semiconductor (410nm) 6500K:
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Here's a gif of Yuji LED's VTC range (400-405nm):
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