Hortilux Metal Ace Conversion (HPS to Metal Halide) Lamp, 400W coco Experienced gardeners know that a

Experienced gardeners know that a perfect outdoor mix is different than a perfect indoor mix

Slightly convex and ribbed design for strength and drainage of any water that may collect on top

Ultra light filters use advanced nano carbon felt technology

The outer frame measurements are 13

Hortilux Metal Ace Conversion (HPS to Metal Halide) Lamp, 400W coco Experienced gardeners know that aHORTILUX Metal Ace (converts HPS to metal halide) conversion lamps are metal halide lamps that operate on high pressure sodium systems. A one dimensional lighting system is easily and economically converted into a complete (metal halide HPS) growing system, providing the full range of spectral energy required for all stages of plant growth and development. These lamps are 100% lead free.