See if there is markings on your ballast. With MH
you MUST match the bulb wattage with the ballast wattage. IE a 175W bulb will NOT work in a 250W ballast, etc. Once you can verfy the wattage of the bulb I take it this is a used setup. Do you have any idea how old the bulb is? MH
bulbs should be replaced yearly. A quick and dirty on MH
bulbs and their K
ratings are below.
The higher the K
rating the more blue specitrum in the bulb. The lower the number the more yellow the light will look. You might prefer a bulb in the 5000-6700K range. The inital coloration of the bulb will shift after the first 100 or so hours of operation.