Although the tubes in your fly zapper may appear to be working and giving out plenty of light, after around 8000 hours run time the amount of useful insect attracting ultra violet 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 lamps for bug killer machines fit most 18w/36w fly zappers that use 60cm T8 bulbs such as Eazyzap Y726, Kingavon BB-IK118, Vermatik Futura Z40, ACV40WP, ACV40

Specifications:

• Wattage: 18 watts
• Bulb length: 60cm / 2ft
• Weight: 60g
• Average life: 10000 hours
• Cap type:  E5
• Quantity: 2 Replacement Bulbs
• Type: T8
• Compatible part no: P153 / BL350 /

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. Please check our other listing for suitable starters