The 1000W Agrosun Gold Metal Halide Horizontal bulbs are intended to be mounted horizontially. They provide 49% more red spectrum than ordinary MH bulbs. 

This is accomplished by a special internal coating that allows it to emit more light from the red end of the spectrum than traditional halides.

The increase in the red spectrum gives your plants a more complete light spectrum for increased fruiting and flowering, yet the AgroSun Gold HID bulbs maintain the intense metal halide brightness.

These bulbs have been acclaimed by professional greenhouse growers and home hobbyists as being the best plant growth bulbs on the market today.

Agrosun Gold MH Horizontal specifications:

Wattage = 1000
Kelvin = 3000 degrees
Lumens = 115,000
Life hours = 12,000

There's no need for bulb switching between metal halide and high pressure sodium when you have an Agrosun Gold!