Abstract: The present invention discloses devices for enhancing regulated plant growth in vegetative and flowering modes. Luminaires include: at least one LED cluster, for providing enhanced regulated plant growth by simulating dynamic natural daylight conditions, each LED cluster having a cluster surface-area dimension less than 0.40 dm2, and each LED cluster including: blue modules having a plurality of blue absorption-band diodes configured to produce a Photosynthetic Photon Flux Density (PPFD) of at least 120 micromoles per square meter per second (?120 ?mol/m2); and red modules having a plurality of red absorption-band diodes configured to produce a PPFD of at least 150 micromoles per square meter per second (?150 ?mol/m2); and at least one hemispherical lens for enabling even distribution of output spectral intensities and output spectral wavelengths from the blue and red modules over a designated, target plant bed, each hemispherical lens disposed to fully enclose each LED cluster.