Positronics Lighting Systems EarthLux 400 Watt High Output HPS Bulb is a horticultural bulbTopping out over 53,000 lumens, 4000K, 20,000 hours and an added high blue spectrum for a balanced, even spectrum, Positronics EarthLux line is our top performer at a price 30% below our competition!

Our EarthLux line has two main features that set us apart from other bulb manufacturers. First, we have improved upon past technologies that do not perform well at the frequency of digital ballasts, making all of our bulbs digital certified. Second, we have made our bulbs with added blue spectrum, notice the spike near the 450nm range on the graph accompanying the other pictures, this means that your plants will tend no to stretch where our competitors will.

In addition to these very important adjustments, we have produced a 400 W HPS bulb that achieves an astonishing 54,000 lumens. And we wrap it up with a 1 year warranty on any defects that cause malfunctions. We have less than 1% failure rate on our bulbs so buy with confidence!

Our High Pressure Sodium Lights are scientifically engineered and tested to provide the essential power and specific spectrum for optimal plant growth. Notice the chart below lists 400 and 660 nanometers as the photosynthetic active radiation, or PAR concentration value. These two ranges, in the visible red and blue spectrum, are the primary values for usable light for your growing plants.