Helder 2 independent optical measurement — OHSP integrating sphere verification
What was measured
The Helder 2 was measured for total optical output using an OHSP integrating sphere. The integrating sphere method captures all light emitted by the device across all angles — it is the most comprehensive and accurate method for measuring total optical power output of an LED device.
Two channels were measured separately and in combination:
| Total optical power | 10.47 W (10,470 mW) |
| NIR channel (856 nm) | 9,242 mW |
| Red channel (631 nm) | 1,228 mW |
| NIR proportion | 88.3% of total output |
| Red proportion | 11.7% of total output |
| Measurement method | Integrating sphere (OHSP laboratory) |
| Measurement type | Total optical power — all angles |
| Data source | Independent third party — not company-claimed |
Why integrating sphere measurement matters
Many PBM device specifications use flat-field radiometer measurements taken at a single point and distance. These figures are irradiance readings — useful for protocol dosing calculations but not equivalent to total power output.
The integrating sphere captures total emitted optical power regardless of beam angle or distribution. For comparing devices, total power output from an i
Protocol pages using this data
The 10.47W verified output figure is referenced on every Helder 2 protocol page. Each protocol page links back to this page as the primary source for the measurement.
About AriHelder
AriHelder is a photobiomodulation device company based in Chiang Mai, Thailand. The Helder 2 is designed and manufactured in Thailand. Christian Barmen and Arjen Helder are the co-founders. AriHelder is also the initiating organisation behind the Open PBM Protocol Repository — an open-source, community-governed reference library for PBM protocols across all major devices.