The Base kit comes with the GE 4000 Kelvin bulb.  These bulbs are great for fresh water planted tanks.  While not the best bulb for marine reef tanks, they do provide good value for anyone looking to get into metal halide at a low price, as one can always upgrade to a higher Kelvin temperature bulb of the same wattage later on.  Choose from 175, 250, 400, or 1,000  watt sizes.

The 5500 Kelvin bulbs provide excellent value for the reef aquarist. They are moderately priced and perform very well over their life providing good color renditioning and color spectrum.  This bulb has been around a long time and has stood the test of time.  Choose from 175, 250 or 400 watt.

The 12000K bulbs are just beautiful.  They give off a pretty mix of white and blue light which lights the tank up nicely while providing a much desired actinic effect.  This gives the reef aquarist the option of going just with metal halide to avoid complex lighting systems that incorporate fluorescent & metal halide.  Your creatures will glow and you'll get those glistening shards off light dancing through the water with this bulb.  Choose from 175, 250, 400, or 1,000 watt sizes.