RF exposure evaluation

FCC ID: 2ASVX-ZJWFBA

RF Exposure Info

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FCCID_4270182

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID:2ASVX-ZJWFBA

Maximum Permissible Exposure Report

1. Product Information
FCC ID 2ASVX-ZJWFBA
Product name WIFI Bulb
ZJ-WFBK-W, ZJ-WFBK-CCT, ZJ-WFBK-RGB, ZJ-WFBK-RGBW, ZJ-WFBL-W,
ZJ-WFBL-CCT, ZJ-WFBL-RGB, ZJ-WFBL-RGBW, ZJ-WFBL-RGBWW,
Model number ZJ-WFBM-W, ZJ-WFBM-CCT, ZJ-WFBM-RGB, ZJ-WFBM-RGBW,
ZJ-WFBM-RGBWW, ZJ-WFBN-W, ZJ-WFBN-CCT, ZJ-WFBN-RGB,
ZJ-WFBN-RGBW, ZJ-WFBN-RGBWW
PCB board, structure and internal of these model(s) are the same,
Model Declaration
So no additional models were tested.
Test Model ZJ-WFBK-RGBWW
Power supply AC 100-240V
IEEE 802.11b: DSSS (CCK,DQPSK,DBPSK)
Modulation Type IEEE 802.11g: OFDM (64QAM, 16QAM, QPSK, BPSK)
IEEE 802.11n: OFDM (64QAM, 16QAM,QPSK,BPSK)
Antenna Type PCB Antenna
Antenna Gain 1.20 dBi (Max.)
Hardware version ZJ-WFPW-RGBWW-KL V1.2, ZJ-LB-RGBWW-K V1.1
Software version V1.0
IEEE 802.11b: 2412 – 2462 MHz
WLAN FCC Operation Frequency IEEE 802.11g: 2412 – 2462 MHz
IEEE 802.11n HT20: 2412 – 2462 MHz
Exposure category General population/uncontrolled environment
EUT Type Production Unit
Device Type Mobile Device

2. Evaluation Method
Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the
public is not exposed to radio frequency energy level in excess of the Commission’s guidelines.
In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as mobile device whereby
a distance of 0.2m normally can be maintained between the user and the device, and below RF Permissible Exposure
limit shall comply with.

In accordance with KDB447498D01 for Simultaneous transmission MPE test exclusion applies when the sum of the MPE
ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated,
numerically modelled or measured field strengths or power density, is ≤ 1.0. The MPE ratio of each antenna is
determined at the minimum test separation distance required by the operating configurations and exposure conditions
of the host device, according to the ratio of field strengths or power density to MPE limit, at the test frequency. Either
the maximum peak or spatially averaged results from measurements or numerical simulations may be used to
determine the MPE ratios. Spatial averaging does not apply when MPE is estimated using simple calculations based on
far-field plane-wave equivalent conditions. The antenna installation and operating requirements for the host device
must meet the minimum test separation distances required by all antennas, in both standalone and simultaneous
transmission operations, to satisfy compliance.

3. Limit
3. 1 Refer Evaluation Method
ANSI C95.1–1999: IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic
Fields, 3 kHz to 300 GHz.
FCC KDB publication 447498 D01 General 1 RF Exposure Guidance v06: Mobile and Portable Devices RF Exposure
Procedures and Equipment Authorization Policies.
FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits.
FCC CFR 47 part2 2.1091: Radiofrequency radiation exposure evaluation: mobile devices

This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd.
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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID:2ASVX-ZJWFBA

3. 2 Limit
Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure
Frequency Electric Field Magnetic Field Power Density Averaging Time
Range(MHz) Strength(V/m) Strength(A/m) (mW/cm²) (minute)
Limits for Occupational/Controlled Exposure
0.3 – 3.0 614 1.63 (100) * 6
3.0 – 30 1842/f 4.89/f (900/f2)* 6
30 – 300 61.4 0.163 1.0 6
300 – 1500 / / f/300 6
1500 – 100,000 / / 5 6
Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure
Frequency Electric Field Magnetic Field Power Density Averaging Time
Range(MHz) Strength(V/m) Strength(A/m) (mW/cm²) (minute)
Limits for Occupational/Controlled Exposure
0.3 – 3.0 614 1.63 (100) * 30
3.0 – 30 824/f 2.19/f (180/f2)* 30
30 – 300 27.5 0.073 0.2 30
300 – 1500 / / f/1500 30
1500 – 100,000 / / 1.0 30

F=frequency in MHz
*=Plane-wave equivalent power density

4. MPE Calculation Method
Predication of MPE limit at a given distance
Equation from page 18 of OET Bulletin 65, Edition 97-01

S=PG/4πR²

Where: S=power density
P=power input to antenna
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

5. Antenna Information
ZJ-MWIR-RGB can only use antennas certificated as follows provided by manufacturer;

Internal Antenna type and Operate frequency Maximum antenna
Note
Identification antenna number band gain
Antenna 0 PCB Antenna 2000 MHz – 2500 MHz 1.20 dBi WLAN Antenna

6. Conducted Power
[2.4GWLAN]
Mode Channel Frequency(MHz) Peak Conducted Output Power (dBm)
1 2412 11.23
IEEE 802.11b 6 2437 11.38
11 2462 10.44
1 2412 13.49
IEEE 802.11g 6 2437 13.57
11 2462 13.00
1 2412 13.60
IEEE 802.11n HT20 6 2437 13.34
11 2462 12.66

This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd.
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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID:2ASVX-ZJWFBA

7. Manufacturing Tolerance
[2.4GWLAN]
IEEE 802.11b (Peak)
Channel Channel 1 Channel 6 Channel 11
Target (dBm) 11.0 11.0 10.0
Tolerance ±(dB) 1.0 1.0 1.0
IEEE 802.11g (Peak)
Channel Channel 1 Channel 6 Channel 11
Target (dBm) 13.0 13.0 13.0
Tolerance ±(dB) 1.0 1.0 1.0
IEEE 802.11n HT20 (Peak)
Channel Channel 1 Channel 6 Channel 11
Target (dBm) 13.0 13.0 12.0
Tolerance ±(dB) 1.0 1.0 1.0

8. Measurement Results
8.1 Standalone MPE
As declared by the Applicant, the EUT is a wireless device used in a fix application, at least 20 cm from any body part of
the user or nearby persons; from the maximum EUT RF output power, the minimum separation distance, r =20cm, as
well as the gain of the used antenna refer to antenna information, the RF power density can be obtained.

[Antenna 0]
Output power Antenna Antenna MPE
Duty MPE
Modulation Type Gain Gain Limits
dBm mW Cycle (mW/cm2)
(dBi) (linear) (mW/cm2)
IEEE 802.11b 12.00 15.8489 1.20 1.3183 100% 0.0042 1.0000
IEEE 802.11g 14.00 25.1189 1.20 1.3183 100% 0.0066 1.0000
IEEE 802.11n HT20 14.00 25.1189 1.20 1.3183 100% 0.0066 1.0000

Remark:
1. Output power including tune-up tolerance;
2. MPE evaluate distance is 20cm from user manual provide by manufacturer;

8.2 Simultaneous Transmission MPE
The sample support one WLAN modular and one antenna, no need consider simultaneous transmission;

9. Conclusion
The measurement results comply with the FCC Limit per 47 CFR 2.1091 for the uncontrolled RF Exposure of mobile
device.

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This report shall not be reproduced except in full, without the written approval of Shenzhen LCS Compliance Testing Laboratory Ltd.
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Document Created: 2019-05-10 00:36:19
Document Modified: 2019-05-10 00:36:19

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