Panasonic FL20SS-D/18 fluorescent light, daylight color, 20-watt, 18-foot length. - Brand: Panasonic - Model: FL20SS-D/18 - Color: Daylight - Size: 20-watt Thank you for viewing. Used for about a year. There is no blackening and it can still be used. There are 4 bulbs. How about as a spare? Also, although not listed, I also have: FCL20, FCL30, FL20, FL30, and occasionally FL40. All are used items. If you have any requests, please comment.