Ignitor, Sodium, 250/400W soil HORTILUX Metal Halide provides optimum

HORTILUX Metal Halide provides optimum spectral energy required for vegetative growth

Roots Organics Extreme Serene kelp extract can be used in conjunction with any potting soil or hydroponic nutrient program

1-pound case contains 4: 1 pound bottles

The graphite conductivity electrode provides greater accuracy because it resists contamination by salt deposits in the sample

Ignitor, Sodium, 250/400W soil HORTILUX Metal Halide provides optimum250 400 watt Sodium Ignitor (all ballasts) Ignitors are components inside ballasts. They take power off the transformer and use it to strike the bulb inside the reflector. Replacement ignitors are available in a variety of wattages, brands, and types. Be sure to review item numbers and descriptions carefully before ordering. Contact your Hydrofarm sales representative for help selecting the proper components.