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Details Compact Ballasts Product Details: Compact Ballasts are the cheapest powerpacks we stock but they are also great value for money. Compact ballasts feature incredible reliability and are the most popular units we sell. Compact Ballast are suitable for starting HPS (High Pressure Sodium) and MH (Metal Halide) lamps. Compact Ballasts have many excellent features and benefits. Easily wall mountable Smart ignitors are timed to protect against lamp failure Thermal cutouts to protect against short circuits Guaranteed against defects for 2 years CE certified Compact Ballasts Tip: Compact ballasts can get quite hot! Don’t panic though as this is normal, the thermally conductive resin they are constructed from is designed to siphon heat from the internal components so they are hot on the outside but cool on the inside.