Safety Human Exposure
1.1 Radio Frequency Exposure Compliance
1.1.1 Electromagnetic Fields
RESULT:
Test item: Self-ballasted LED lamps
Identification / Type No.: LED2407G8NA
FCC ID: FHO-LED2407G8NA
IC: 10912A-LED2407G8NA
Test standard: CFR47 FCC Part 2: Section 2.1091, CFR47 FCC Part 1: Section 1.1310, FCC KDB Publication 447498 D01 V06, RSS-102 Issue 6 December 2023
Status: Pass
Product Classification
This device is defined as a transmitting device designed for use in other than fixed locations. It is generally 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.
Max EIRP: -1.06 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
S = PG / (4πR²)
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)
Or:
S = EIRP / (4πR²)
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 as follows:
- Below 20 MHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 1 W (adjusted for tune-up tolerance).
- At or above 20 MHz and below 48 MHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 4.49/f0.5W (adjusted for tune-up tolerance), where f is in MHz.
- At or above 48 MHz and below 300 MHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 0.6 W (adjusted for tune-up tolerance).
- At or above 300 MHz and below 6 GHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 1.31×10-2f0.6834W (adjusted for tune-up tolerance), where f is in MHz.
- At or above 6 GHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 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 | 8.44 | 20 | 0.0014 | 1 |
| Zigbee | 9.9 | 8.84 | 20 | 0.0015 | 1 |
| Thread | 9.9 | 8.84 | 20 | 0.0015 | 1 |
IC
| Mode | Frequency (MHz) | *Measured RF Output Power (dBm) | EIRP (dBm) | EIRP (W) | Limit (W) |
|---|---|---|---|---|---|
| BLE | 2402 | 9.5 | 8.44 | 0.0070 | 2.6764 |
| Zigbee | 2405 | 9.9 | 8.84 | 0.0077 | 2.6787 |
| Thread | 2445 | 9.9 | 8.84 | 0.0077 | 2.7091 |
Note: BLE RF Output Power: Refer CN25NYHJ 001. Zigbee Output Power: Refer CN256XOS 001. Thread Output Power: Refer CN25RYRX 001. BLE, Zigbee and Thread share one RF chip and antenna, so no need to evaluate simultaneous transmission.
Conclusion
The distance between antenna and human is larger than 20 cm in normal use. Therefore, the maximum calculation results meet the requirement of Radio Frequency Exposure limit.
