I installed the bulb with no rush in about 20-30 minutes. First, unplug the power cord and remove the 4 screws that hold the air purifier in place. Then carefully pull out the whole block. Lay the device face down on a towel to avoid damaging the blue indicator light on the front. Remove the two screws holding the bulb and honeycomb cover. Gently pull on the honeycomb cover and the bulb will pop out of the connector on the bottom. Take your time and slide the bulb about 3/4 out of the honeycomb block. As a safety measure you will see a rubber O-ring that prevents the lamp from slipping out of the housing. I carefully took a straight blade knife and cut out the o-ring from one side of the hole. The lightbulb pops out immediately. Then WHILE GLOVES, take a replacement bulb (oil from your hands shortens bulb life) and insert the new bulb's pins into the block. Gently slide the honeycomb onto the top of the lamp and fasten the two screws. Next time you use it, you'll see a dented black button next to one of the screws. This button activates the bulb when pressed against the AC channel. When I first put in a new bulb and connected the power, nothing happened - no blue light came on outside of the case. I pressed this button and the device turned blue on the outside. Fasten the 4 screws on the outside of the device and the problem is solved. I can't comment on the durability of this bulb but it looks the same as the one I replaced.
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