Suppliment Halide's with LED's

[sphelps]

In terms of PAR you have to think about what it means, this shows the typical chlorophyll spectrum that plants use for photosynthesis, you'll notice it's all in the red and blue so a light that emits purely blue light will have high PAR. Same reason that the LED grow lights only have blue and red leds, whites aren't as efficient, they contain some but not as much.



But the main reason I suggested royals for supplemental is they IMO are the real advantage to LED, they have a nice actinic affect while maintaining good output and will be beneficial for color and growth when combined with other lights. White leds offer very little in those areas.