I did come across a warning about ultra blue LED lights, they can damage the eye.
High-energy visible light
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In ophthalmology, high-energy visible light (HEV light) is high-frequency light in the violet/blue band from 380 to 530 nm in the visible spectrum. HEV light has been implicated as a cause of age-related macular degeneration.
Some sunglasses are now designed specifically to block HEV.
 Blue-light hazard
Blue-light hazard is defined as the potential for a photochemical induced retinal injury resulting from radiation exposure at wavelengths primarily between 400 nm and 500 nm. The mechanisms for photochemical induced retinal injury are caused by the absorption of light by photoreceptors in the eye. Under normal conditions when light hits a photoreceptor, the cell bleaches and becomes useless until it has recovered through a metabolic process called the visual cycle. Absorption of blue light, however, has been shown to cause a reversal of the process where cells become unbleached and responsive again to light before it is ready. This greatly increases the potential for oxidative damage. By this mechanism, some biological tissues such as skin, the lens of the eye, and in particular the retina may show irreversible changes induced by prolonged exposure to moderate levels of UV radiation and short-wavelength light.
im currentlry using LEDs for veg only, works great very tight plants the 3 plants in the pic are mothers,however i wouldnt use LEDs for flowering they just dont do the job, im flowering under 400w hps and 400w mh, no comparison :rauch08: