A 1000 Watt Metal Halide Ballast from Tridonic Lighting that requires an ignitor and capacitor to operate. This is an efficient and robust that gear features compact windings and minimal magnetic leakage field, resulting in very low noise when running. Offering compact dimensions this magnetic choke achieves a service life of up to 100,000 hours.
I gave it less than the maximum because the lamp I ordered with the fitting was defective. After I rang them about it, they sent me another one of a different make. Also, if this fitting is being installed by a DIY person, the information that comes with it says nothing about connecting the fitting to the supply. The terminal block is not marked L and N and it is easy to get the polarity wrong with possible catastrophic results.