There are two main considerations to decide upon when chosing Metal Halide bulbs and systems: wattage and color temperature.

There are generally two considerations when planning wattage, tank depth and the requirements of various types of corals. Tanks 18" and shorter will, typically, use 175 or 250 watt MH bulbs. Typically, tanks 24" and over will use 400 watt MH bulbs. These are all just general statements to assist in going the correct route with chosing wattage. They are not absolute truths.

The K at the end of color rating for each bulb stands for Kelvin. This is a measurement of the color temperature. The higher the Kelvin rating, the cooler (bluer) the color of light given off by the bulb. In general, the color given off by the 10,000K German is interpreted as being a perfect white color.

150 Watt MH Bulbs

175 Watt MH Bulbs

250 Watt MH Bulbs

400 Watt MH Bulbs

75 Watt MH Bulbs

Image	Name	Price
	175 Watt Metal Halide Ballast - Assembled 175 Watt MH Assembled Ballast - includes ballast enclosure, on/off switch, powercord, mounting bracket, and mogul socket	$94.95	Buy More