Duquesne Light and Allegheny Power both install Cooper Lighting OVZs and OVXs but their wattage configuration is different though for HPS. Allegheny Power replaces defective 175 watt MV streetlights with 100 watt HPS stretlights only, Duquesne Light replaces defective 175 watt MV streetlights with 70 watt HPS and 150 watt HPS streetlights depending on the location and volume of traffic. I have seen defective 400 watt MV streetlights in their area replaced with 250 watt HPS and 400 watt HPS streetlights, even 150 watt HPS. Allegheny Power just replaces defective 250 watt MV and 400 watt MV with 200 watt HPS streetlights.