Ballasted green neon bulbs (1)

These 6 green neon bulbs come from the same power strip which has already sent to recycle bin. They all have a ballast resistor with 150 kohms resistance. Green neon bulbs turn dark quite fast if the ballast resistance is too small, so their brightness usually do not last for more than half a year when turned on continuously.
The condition of each bulb may tell how long the corresponding electrical socket has been used, suggesting bulb 1 may be about a week, bulbs 2 and 3 are about a month, bulb 4 is about three months, and the last two have been turned on for more than half a year.

Warning: High voltage is applied to power these neon bulbs. If you are going to play around with these bulbs or any other high voltage components, safety precautions must be taken or you may have a risk of electric shock.