Hortilux Super HPS Enhanced Spectrum Bulb spl_hrg with the main difference that

with the main difference that the multi-bucket system uses a multi-output air pump

Free of added nitrogen

but shifted ratios on the NPK to allow for the 2-4 week vegetation time that indoor growers are accustomed too (versus the 2-3 month outdoor vegetation time)

Better roots equal healthier plants

non-pollutant renewable resource

Hortilux Super HPS Enhanced Spectrum Bulb spl_hrg with the main difference thatExtend the growing season to 365 days a year with Eye HortiluxTM grow lamps. Choose Eye Hortilux lamps to raise your lighting system to a new level of performance, optimizing spectral energy levels that promote vigorous plant growth. EN lamps are completely lead free and contain less mercury than standard HPS lamps. The environmentally friendly lamps (EN) can usually be disposed of without being recycled; however, please check your state laws first,