Safety Human Exposure
1.1 Radio Frequency Exposure Compliance
1.1.1 Electromagnetic Fields
RESULT: Pass
| Test item | Self-ballasted LED lamps |
| Identification / Type No. | LED2406G4NA |
| FCC ID | FHO-LED2406G4NA |
| IC | 10912A-LED2406G4NA |
| Test standard | CFR47 FCC Part 2: Section 2.1091, CFR47 FCC Part 1: Section 1.1310, FCC KDB Publication 447498 D04 V01, RSS-102 Issue 6 December 2023 |
Product Classification
This device is classified as a transmitting device designed for use in non-fixed locations. It is intended to be used such that a separation distance of at least 20 centimeters is normally maintained between the RF source's radiating structure(s) and the body of the user or nearby persons.
Maximum antenna gain: -1.51 dBi
FCC Radio Frequency Exposure Limit
| Frequency range (MHz) | Electric field strength (V/m) | Magnetic field strength (A/m) | Power density (mW/cm²) |
|---|---|---|---|
| 300-1,500 | -- | -- | f/1500 |
| 1,500-100,000 | -- | -- | 1.0 |
Radio Frequency Exposure Calculation Formula
The power density (S) is calculated using the following formulas:
S = (P * G) / (4 * π * R²)
Where:
- S = power density (in appropriate units, e.g., mW/cm²)
- P = power input to the antenna (in appropriate units, e.g., mW)
- G = power gain of the antenna in the direction of interest relative to an isotropic radiator
- R = distance to the center of radiation of the antenna (appropriate units, e.g., cm)
Alternatively:
S = EIRP / (4 * π * R²)
Where:
- EIRP = equivalent (or effective) isotropically radiated power
IC Field reference level exposure exemption limits
Field reference level (FRL) exposure evaluation is required if the separation distance between the user and/or bystander and the device's radiating element is greater than 20 cm (i.e., mobile devices), except when the device operates under the following conditions:
- Below 20 MHz: source-based, time-averaged maximum EIRP ≤ 1 W (adjusted for tune-up tolerance).
- At or above 20 MHz and below 48 MHz: source-based, time-averaged maximum EIRP ≤ 4.49/f0.5 W (adjusted for tune-up tolerance), where f is in MHz.
- At or above 48 MHz and below 300 MHz: source-based, time-averaged maximum EIRP ≤ 0.6 W (adjusted for tune-up tolerance).
- At or above 300 MHz and below 6 GHz: source-based, time-averaged maximum EIRP ≤ 1.31×10-2f0.6834 W (adjusted for tune-up tolerance), where f is in MHz.
- At or above 6 GHz: source-based, time-averaged maximum EIRP ≤ 5 W (adjusted for tune-up tolerance).
a) EUT RF Exposure Evaluation standalone operations
FCC
| Mode | *Measured RF Output Power (dBm) | EIRP (dBm) | Distance (cm) | Power Density (mW/cm²) | Limit (mW/cm²) |
|---|---|---|---|---|---|
| BLE | 9.5 | 7.99 | 20 | 0.0013 | 1 |
| Zigbee | 10.1 | 8.59 | 20 | 0.0014 | 1 |
| Thread | 10.0 | 8.49 | 20 | 0.0014 | 1 |
IC
| Mode | Frequency (MHz) | *Measured RF Output Power (dBm) | EIRP (dBm) | EIRP (W) | Limit (W) |
|---|---|---|---|---|---|
| BLE | 2442 | 9.5 | 7.99 | 0.0089 | 2.7068 |
| Zigbee | 2445 | 10.1 | 8.59 | 0.0102 | 2.7091 |
| Thread | 2445 | 10.0 | 8.49 | 0.0100 | 2.7091 |
Note: BLE RF Output Power: Refer CN25UUEN 001. Zigbee Output Power: Refer CN25ZCEW 001. Thread Output Power: Refer CN2553L4 001. BLE, Zigbee and Thread share one RF chip and antenna, so no need to evaluate simultaneous transmission.
Conclusion
The distance between the antenna and human is larger than 20 cm in normal use. Therefore, the maximum calculation results meet the requirement of the Radio Frequency Exposure limit.
