I have just replaced the bulb in my Philips wake-up light hf3475. Hurrah! It was quite a task and involved ungluing the existing bulb after taking off the back and lifting off the white rounded plastic cover at the base of the bulb. I replaced it with a Philips master pl-c 4p bulb 26 watt 1800 lumen and is now working perfectly. quite an advanced tinkering session 4 for a beginner I would say, and ideally you need a soldering iron to connect what I think is an earth wore with a little cage that slips between the the bars of the bulb- but I got a feeling this might not be necessary I just used crocodile clip to hold the contacts together.