---
title: "How we research"
url: "https://glowbytech.com/how-we-research/"
updated: "2026-10-12"
---

# How we research

We do not test devices in a lab or claim hands-on use. Every page compiles public, checkable information and links to it.

## What we read

- Manufacturer spec sheets and manuals
- FDA 510(k) clearance records (device, cleared indication, K-number)
- Peer-reviewed studies on PubMed
- Owner reviews on retailer sites and forums, summarized as patterns with links

## How we read device specs

- **Wavelength (nm):** red light is usually 630 to 660 nm, near-infrared 810 to 850 nm. We list exact values when the maker publishes them.
- **Irradiance (mW/cm²):** power reaching the skin. Marked “not published” when the maker does not disclose it.
- **FDA 510(k):** we write “FDA cleared” only together with the cleared use, the K-number and a link to the FDA record.
- **Session time, LED/diode count, warranty, price.**

## How we rank

When we compare devices, we look at the same points for each one, in this order:

- FDA clearance for the use we discuss, with the K-number and a link to the FDA record.
- Published research on that type of device.
- Specs that matter for results: wavelength, number of lasers or LEDs, session time and schedule.
- Fit, comfort and ease of use, from the brand's documentation and owner reviews.
- Price, warranty and refund terms, checked on the brand's own site.

Each list says who each pick suits best, because the right device depends on your budget, schedule and goals.

## What we will not do

- Claim a device treats or cures a medical condition.
- Use self-awarded star ratings.
- Let commission rates decide rankings.

## Updates

Every page shows when it was last checked. We recheck prices, specs and codes regularly and update that date when we do.