Measured performance
Reconciled optical output, irradiance, and dose data
This page presents electrical input, optical output, irradiance, and emitting area measurements. All values are measured under stated geometry so that electrical power, optical power, and delivered dose close under basic conservation-of-energy checks.
calibrated irradiance
calibrated irradiance
calibrated irradiance
Thorlabs S121C
Wavelengths
Measured optical output
Reconciled electrical and optical data
All optical measurements were taken on production-representative hardware under steady-state conditions after thermal stabilization. Irradiance values reflect derated sustained output, compensating for thermal sag to ensure stated dose remains reproducible across full session duration.
Configuration and session logging are provided via NFC. Irradiance measurements were manually acquired and time-aligned with logged operating states.
| Mode | Electrical input (W) | Irradiance (mW/cm²) | Emitting area (cm²) | Optical output (W) | Optical fraction |
|---|---|---|---|---|---|
| 660 nm red | 3.5 | ~35 * | 20 | 0.7 | 20% |
| 805 nm NIR | 3.5 | ~35 * | 20 | 0.7 | 20% |
* Output compensation used to maintain steady output optimized for 10-minute session. Electrical input, irradiance × area, and derived optical output reconcile within expected physical limits.
Individual unit calibration
Per-unit calibration record
Each unit is individually tested and calibrated prior to shipment using a Thorlabs PM100D with S121C photodiode sensor (NIST-traceable calibration). The calibration record below reflects an evaluator unit measured under defined geometry prior to shipment. Production units will each carry their own serial-numbered record.
Output stability
Irradiance vs time
The chart below shows near-contact irradiance over time for NIR and combined modes under steady-state operation. Derated output values are selected to remain stable across the full session duration, compensating for LED thermal sag at higher drive levels.
Figure 1. Near-contact irradiance vs time for NIR and combined modes under steady-state operation. Output shown after thermal stabilization at derated drive levels.
Measurement methodology
Geometry and instrumentation
Optical power density was measured using a Thorlabs PM100D power meter with an S121C photodiode sensor (400–1100 nm, 500 mW range). The S121C carries NIST-traceable calibration, providing a direct traceability chain to national measurement standards.
- Sensor positioned normal to the emitting surface at near-contact distance
- Aperture-averaged irradiance — measurements taken at multiple locations across the emitting window
- Red and NIR channels measured independently; wavelength set to 660 nm and 805 nm respectively
- Combined output reflects derated individual channel settings (65% red, 70% NIR of maximum)
- All measurements taken after thermal stabilization
- Published values reflect derated sustained output — compensating for thermal sag to ensure dose reproducibility across a full session
Derived exposure times
Session duration to reach target dose
Exposure times derived directly from measured irradiance values using: Exposure time (s) = Dose (J/cm²) ÷ Irradiance (W/cm²)
Values are illustrative and not usage recommendations. Individual protocols vary based on treatment area, target dose, and clinical context.
| Mode | Irradiance (mW/cm²) | 10 J/cm² | 20 J/cm² |
|---|---|---|---|
| 660 nm red | 35 | ~285 s (~4.7 min) | ~570 s (~9.5 min) |
| 805 nm NIR | 35 | ~285 s (~4.7 min) | ~570 s (~9.5 min) |
| Combined * | 49 | ~200 s (~3.4 min) | ~400 s (~6.6 min) |
* Combined mode irradiance reflects a conservative sustained figure accounting for shared thermal load between channels. Individual channel figures are measured independently under single-channel operation.
Thermal behavior
Internal temperature vs time
Internal temperature vs time data reflect expected thermal stabilization behavior during multi-minute operation in combined mode. Thermal management is passive — no active cooling is required, and no cooling interval is needed between sessions under typical use conditions.
Figure 2. Internal temperature vs time for combined mode operation. Data reflect steady-state thermal behavior under near-contact use conditions.
Electrical and electromagnetic
EMC and interference
The device contains no intentional RF transmitters during operation. Internal switching regulators and control electronics operate below audible frequencies and are confined within the enclosure. During informal testing, no functional interference was observed when operating the device in proximity to common consumer electronics, including mobile phones and wireless charging equipment.
No claims of regulatory compliance or electromagnetic certification are made.
Regulatory context and important notes
Rejuvulite is designed and presented as a consumer wellness device and is not marketed as a medical device. No claims are made regarding diagnosis, treatment, cure, or prevention of disease. Individual experience may vary depending on distance, duration, and usage pattern.
The measurements and observations documented on this page characterize device behavior under defined conditions and do not constitute certification, regulatory approval, or compliance testing. In developing the hardware, general principles from established safety and performance standards were considered as reference points only, including:
- Electrical and mechanical safety practices commonly applied to consumer electronics
- Photobiological safety concepts related to wavelength, exposure, and thermal behavior
- Electromagnetic compatibility considerations relevant to battery-powered electronic devices
Formal testing against regulatory standards (e.g., FDA medical device regulations, IEC medical standards, FCC emissions limits) has not been conducted unless explicitly stated. This contextual information is provided for transparency and does not imply regulatory classification or clearance.