Although the tubes in your fly zapper may appear to be working and giving out plenty of light after use of around 6000 hours run time the amount of useful insect attracting UV light coming from your old lamps drops to a level where it will no longer be attracting insects to your bug killer These Replacement UV blacklight bulbs for bug killer machines fit most 16 Watt fly zappers that use 8 Watt 300mm T5 bulbs such as Eazyzap CE983 P154 P313 Y724 Y727 CB827 CB828 CB829 CB830 CB897 CB898

Specifications:

• Wattage: 8 watt
• Bulb length: 30cm / 12 inches
• Weight: 60g
• Average life: 6000 hours
• Cap type:  G5
• Quantity: 2 tubes
• Type: T5

It is also advisable to replace the starters in your insect killer when replacing the bulbs as your old starters may not be able to provide enough power to reliably light your new lamps. See suitable starters on this listing www.ebay.co.uk/itm/293129730820