Led lamps with improved quality of light

An illumination system comprising:

• at least one LED device configured to emit LED light having a peak emission wavelength within a range 405-430 nm, said at least one LED device having an external quantum efficiency greater than 45% measured at an ambient temperature of 25° C. and at a current density of 40 A/cm2;
• a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light;
• and
• wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a CCT and a CIE whiteness, and wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is a sufficient portion of said first power such that said CIE whiteness is at least equal to a reference CIE whiteness of a blackbody radiator having the same CCT.

An illumination system comprising:

• at least one LED device configured to emit LED light having a peak emission wavelength within a range 405-430 nm;
• a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light;
• and
• wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a peak between 390 nm and 430 nm and a valley between 470 nm and 490 nm, wherein said valley has a low point of essentially zero, wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is at least 4% of said first power.