Best budget
Beauty Pie All Systems Grow LED cap review
The lowest list price of the four, at £332, with 655 nm red light and a footnote that this cap was not the device in the studies.
We compare hats on wavelengths, published output, coverage, session time, published clinical evidence, UK price, warranty and returns. How we review.
The Beauty Pie All Systems Grow cap is our best budget pick at £332, with 125 LEDs at 655 nm, a stated 20 mW/cm² and 10-minute sessions. Beauty Pie says this device has not had an independent clinical test. The UK page listed it as out of stock when checked in October 2026.
How we compared these hats
We compared wavelengths, published output, coverage, session time, published clinical evidence, UK price, warranty and returns.
- Wavelengths The nanometres each manufacturer prints on its product page.
- Published output The power figure on the product page, in the units the brand uses.
- Coverage The coverage figure each brand publishes, or “Not stated” when the page does not give one.
- Session time The session length printed on the product page.
- Published clinical evidence The study, series or survey the brand itself describes for that device.
- UK price The price on the brand’s own UK page in October 2026.
- Warranty The warranty terms this guide has recorded, or a pointer to the brand’s UK page.
- Returns The returns terms this guide has recorded, or a pointer to the brand’s UK page.
On this page
On this page
Best budget
Beauty Pie All Systems Grow
£332
- 10 minutes
- 655 nm
- 20 mW/cm²
The lowest list price of the four, with a single red wavelength and a stated power density. Beauty Pie says this cap was not the device in the studies it cites.
Key specs
- Price
- £332
- Availability
- Out of stock. Checked October 2026
- Form
- Cotton cap, removable panel
- Wavelengths
- 655 nm red
- Light source
- LED
- Count
- 125 LEDs
- Output
- 20 mW/cm² at the surface
- Session
- 10 minutes
- Coverage
- Not stated
- Fit
- Not stated
List price. A member price is mentioned, but no member figure is shown. Specs from the Beauty Pie product page. Source
Pros
- Lowest list price, at £332.
- 655 nm red light and a stated 20 mW/cm².
- 125 LEDs in a cap with a removable panel.
- The footnote is unusually clear that this device was not the one in the studies.
Cons
- No independent clinical test of this cap, by the brand’s own account.
- No fit range and no coverage figure.
- A member price is mentioned, but no member figure is shown.
If you want the lowest price, start here. Beauty Pie’s All Systems Grow cap is a grey cotton baseball cap with 125 LEDs at 655 nm, a removable panel, and a 10-minute session. The list price is £332.
It is our best budget pick for that price and that wavelength. The brand is frank that this particular cap has not been independently tested. The UK page listed it as out of stock when checked in October 2026.
What are you buying with the Beauty Pie cap?
The instructions say daily use for 8 to 12 weeks, then three or four times a week. The footnote, which is the part to read, says visible change is typically put at 12 to 24 weeks. Those clocks do not match. If you are giving it a fair run, use the longer one.
655 nm is a single red wavelength in the range hair studies use. One wavelength is not a disadvantage next to a hat that lists three. The page states 20 mW/cm² at the device surface.
No head size is printed. No coverage percentage is printed. If your concern is a receding hairline, look at where the LEDs sit, not at the crown of the cap in the photo.
The page calls the cap a non-invasive alternative to medicines and surgery. “Alternative” is a shopping word. Minoxidil and, for men, finasteride are still the treatments the NHS names for pattern hair loss, with the caveat that they do not work for everyone.
What does the Beauty Pie footnote actually say?
The selling lines say the treatment is clinically proven to deliver thicker, fuller-looking hair and to reduce shedding. The asterisk changes the meaning. Beauty Pie says the language is based on published studies of similar 650–655 nm devices, names papers including Gentile and Garcovich, Lueangarun and colleagues, and Yang and colleagues, and then says this device has not undergone independent clinical testing. Results vary. The product is for cosmetic use only, and is not intended to diagnose, treat, cure or prevent any disease.
Studies of similar devices are the category evidence on does red light therapy work. They are not a trial of this panel in this cap. “Cosmetic use only” also means you should not upgrade the wording into a medical claim. More on that split is on the UK regulation page.
£332 is the lowest list price in this comparison. The footnote is the part of the page to read before you decide.
Product photos
Common questions
How much is the Beauty Pie LED hair cap?
£332. The page talks about a member price without printing a member figure. The UK page listed it as out of stock when checked in October 2026.
Has this cap been clinically tested?
Beauty Pie says it has not. The page points to published studies of similar 650–655 nm devices, and says visible change is typically discussed at 12 to 24 weeks.
What power figure does the page print?
20 mW/cm² at the device surface, with 125 LEDs and a 10-minute session.
How do you use it?
The page says 10 minutes a day for 8 to 12 weeks, then 3 to 4 times a week. The footnote talks about 12 to 24 weeks for a visible change. Follow the manual you receive.
Sources
- Beauty Pie All Systems Grow H-Wave LED cap — Price, stock, LED count, wavelength, power-density footnote and use instructions.
- Perez and colleagues, systematic review
- NHS: Hair loss
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