This standard UV replacement tube 2-pin lasts about 300 operating hours.
This is an ELECTRONICALLY STARTED TUBE (see explanation)

UV gels are cured by UV light. The adhesion of UV gels directly depends on the quality of the tubes. These tubes are suitable for most UV light curing devices with a 2-pin socket and imported devices (electronic starting).

Explanation:
Over time, imported devices with electronic starting have used the same tube socket as those with induction starting. Which tube is right for your lamp??? It's quite simple to test!

If the light builds up when starting the device (blink - blink - light on), then it is induction starting.
If the device starts using a light sensor and the light comes on IMMEDIATELY (like a light switch), then it is electronic starting.

You can select your tube based on this criterion! When replacing tubes, PLEASE ALWAYS replace ALL tubes at the same time (so for a 4-tube device, replace ALL 4, for a 5-tube device, replace ALL 5, etc.).