The short version
- A corded bedside lamp with 20 light levels (about 1 to 300 lux at 45 cm, per the manual) that ramps up over 20 to 40 minutes before a set alarm time, then plays a wake sound or FM radio.
- $107.36 on Sep 30, 2026 for the HF3520/60 (white), sold and shipped by Amazon.com.
- It is an alarm clock with a gradual light, not a general room lamp; Philips itself says it is "not a general illumination product."
The light ramps up before your alarm, then the sound follows.
Not used at this time of day.
Not used at this time of day.
An optional dimming timer exists for lights-out, but the main job is the morning.
What the spec shows
These figures come from the Philips HF3520 user manual (the English section of the PDF Philips hosts), cross-checked against the Amazon listing for ASIN B0093162RM, both read on Sep 30, 2026.
| Spec | Value | What to know |
|---|---|---|
| Light output | Levels 1–20, approx. 1–300 lux at 45 cm | You choose the level the ramp ends at. The same 20 levels work when you use it as a reading lamp. |
| Light color | Approx. 1500–2800 K | The manual describes the color moving from deep red toward a brighter warm white as it ramps. |
| Sunrise duration | 20, 25, 30, 35 or 40 min | Default is 30 minutes. The sound starts once the ramp ends. |
| Alarms | 2 profiles | For example, a weekday and a weekend time, each with its own light level, sound and volume. |
| Wake sounds | 5 natural sounds or FM radio | The listing says five sounds; the manual says "several." FM band 87.5–108.0 MHz. |
| Snooze | 9 min | Tap the top. The lamp stays on and only the sound pauses. |
| Fall-asleep timer | 5–60 min | The light dims (and the radio can fade) over the time you pick. |
| Display | Brightness 0–4 | Level 0 switches it off; touch it to see the time. It brightens by itself in a lit room. |
| Power | Mains adapter, 24 V DC, 12 W unit | No battery for the lamp. The clock time survives a power cut of up to about 8 hours. |
| Size and weight | Approx. 20 × 20 × 15 cm, 0.76 kg | About 7.9 × 7.9 × 5.9 in. Needs a real patch of nightstand. |
How it holds up in use
The idea is simple. Instead of silence followed by a sudden noise, the lamp starts dim and warm, gets brighter over the sunrise time you set, and reaches your chosen level at the alarm time, when the sound begins. The manual suggests placing it 16 to 20 inches (40 to 50 cm) from your head, for example on a bedside table, and at a height where a pillow or duvet does not block it. There is no on/off switch; the only way to fully power it down is to unplug the adapter.
The controls are a small set of buttons (menu, plus, minus, select, two alarm buttons, lamp, radio and the fall-asleep button). Setting an alarm profile means stepping through the time, the light level and the sound volume. A 90-second demonstration mode lets you watch a compressed version of the ramp before you rely on it. Button clicks can be turned off, which matters in a quiet room. Cleaning is a soft dry cloth; the manual warns against solvents. The US manual lists a two-year warranty and a 90-day money-back program run by Philips, each with its own conditions.
What the listing says is a different matter. Its bullet points make claims about mood, energy and "physician" recommendations, with footnotes pointing to Philips' own studies. We have not reviewed those studies and do not repeat the claims. What public research does support is more general: the National Institute of General Medical Sciences notes that light and dark have the biggest influence on the body's roughly 24-hour rhythms [1], and a 2019 review in Somnologie explains that, broadly, light in the morning tends to shift the body clock earlier while light in the evening tends to shift it later, with effects that depend on timing, intensity and the light you saw earlier in the day [2]. That is research on light and timing in general. It does not tell you what this particular lamp will do for any one person, and a bedside lamp is not the same thing as stepping outside.
If you share the room, the manual itself warns that another person may be woken by the light even when they are further from it. It also notes the lamp is not meant to replace sleep time and lists a medical caution (check with a doctor first if you have a history of mood problems). If waking up is a persistent struggle, talk to a clinician rather than relying on a lamp.
How to fit it into your day
This is a sequence for setting the lamp up and using it, not a promise about how you will feel.
Place it and set the clock
Put it 16 to 20 inches from your pillow at roughly head height, plug in the adapter, and set the clock (12- or 24-hour) when it asks on first power-up.
Build one alarm profile evening before
Choose the wake time, a middle light level to start (the manual suggests lowering it if you wake too early and raising it if the sound usually wakes you first), a wake sound, and a modest volume.
Leave the ramp at 30 minutes for a week
The default sunrise time is 30 minutes. Try it for a few mornings before changing to 20 or 40 minutes, so you are adjusting one thing at a time.
Get up and get daylight around 06:30–07:00
When the sound starts, switch it off rather than snoozing if you can, open the curtains, and step outside for a few minutes if that fits your morning. Our morning light habit note covers what the research says about that habit.
Keep weekends close
Use the second alarm profile for a weekend time that is not wildly different from weekdays, and review the light level once a season as sunrise times change.
Price and where it is sold
On Sep 30, 2026, the Amazon listing for the Philips SmartSleep Wake-up Light HF3520/60 (white, "Colored Sunrise Simulation" style) showed $107.36, in stock, shipped and sold by Amazon.com, with a free 30-day refund or replacement window. The listing is here: amazon.com/dp/B0093162RM. Prices on this model move; read the figure as a snapshot for that date.
Who should look elsewhere
- Anyone who needs a portable or battery-powered alarm: this runs on a mains adapter and has no battery for the lamp.
- Anyone wanting phone-app control or a bright room light: the HF3520 is set with on-device buttons and tops out at a bedside-level brightness.
- Anyone sharing a bed with a light-sensitive partner who wakes at a different time.
- Anyone for whom waking, tiredness or sleep timing is a persistent problem should talk to a clinician first; a lamp is not a substitute for care.
Sources
- National Institute of General Medical Sciences (NIH). Circadian rhythms fact sheet: what drives the body's daily cycles and the role of light. Accessed Sep 30, 2026. link
- Blume C, Garbazza C, Spitschan M. Review of how light affects circadian rhythms, sleep timing and mood. Somnologie. 2019;23(3):147–156. PMC6751071. link
- Philips. HF3520 user manual (English, Spanish, French), including specifications, safety notes and warranty. Accessed Sep 30, 2026. link
- Amazon.com. Listing for Philips SmartSleep Wake-up Light HF3520/60 (ASIN B0093162RM): title, features, price, seller and return window. Accessed Sep 30, 2026.
This entry describes a product and is not medical advice. If sleep, energy, focus or physical discomfort is a persistent concern, talk to a qualified clinician; a household product is not a substitute for care.