Although the tubes in your fly zapper may appear to be working and giving out plenty of light after use of around 10000 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 8 Watt/16 Watt fly zappers that use 300mm T5 bulbs such as Eazyzap P154, P313, Y724 and Y727

Specifications:

• Wattage: 8w
• Bulb length: 30cm / 12 inches
• Weight: 60g
• Average life: 6000 hours
• Cap type:  G5
• Quantity: 4 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