Thank you for viewing. Used mercury lamps, manufacturer unknown. HF200X, 12 bulbs will be shipped, but one bulb is burned out. It got mixed up when removing them from the warehouse, and I couldn't confirm if it lights up, so I will ship them all together. Production date and usage time are unknown. All are used, and although you can't see it in the photos, they are a mix of JAPAN and CHINA. About half and half. I have already packed them, so I checked the photos by enlarging them. The screwdriver in the photo is just to keep them from rolling around. They will be wrapped in bubble wrap and shipped.