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The beeping isn’t that harsh, but in my opinion the birds and water sounds on models such as the Philips HF3510 are much nicer (that model is much more expensive though!). The light itself has a nice warm tint to it, much nicer than a regular bulb and if you haven’t used a wake-up light before you will most definitely notice the difference in the quality and tone of the light. The LED bulb is rated for 16,000 hours, which means even if you use it every day you will get 87 years of life out of it, which isn’t bad! This is cheaper to run, there are no bulbs that need replacing and it won’t give off much heat compared to a halogen light. The Philips HF3500, as is common in most similar products these days, uses an LED light. So if for instance you are using it at level 7 to read before bed but want it to reach brightness level 10 when it wakes you up in the morning you will need to manually set it at level 10 before you go to sleep. The time display on the front can be adjusted to one of four brightness settings and you can also use the light as a reading lamp although remember you will need to reset the brightness of the lamp to your required wake up brightness before you sleep. A beeping that starts softly and slowly gets louder after a minute and a half. When the clock gets to the alarm time you set and the light reaches its maximum brightness an audible alarm will start to sound. So say for instance you set the alarm to 7am it will then start to lightly glow at 6.30am gradually increasing in intensity until it reaches its maximum brightness at 7am.
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The light will start to glow 30 minutes prior to the alarm time you set. So chose your brightness setting, between 1 and 10, and then the time you want the alarm to wake you up. It has ten brightness settings with the highest setting, number 10, being the equivalent of 200 lux light intensity. It gradually lights up over a period of 30 minutes to a preset brightness that you chose. The Philips Wake Up Light HF3500 works in a similar way to most of its predecessors. So How Does The HF3500 Wake Up Light Work? 1 x Philips Wake-Up Light Alarm Clock HF3500.Product Dimensions – H 180mm x W 180mm x D 115mm.Box Dimensions (WxHxD) – H200 x W200 x D130mm.