May 14, 2026 libilly

LED Tube Light: How to Read the

AnLED tube lightis a light-emitting diode (LED) lamp designed to fit into fixtures originally designed for fluorescent lamps, such as T8, T12, or T bi-pin sockets^［1］. Unlike traditional fluorescent tubes which rely on the ionization of gas within a glass tube, LED tubes utilize solid-state lighting technology.

LED Tube Light: How to Read the Specification Sheet-2 — LED Tube Light: How to Read the Specification Sheet【Figure 2】

For facility managers, electrical contractors, and procurement specialists, understanding the technical specification sheet (datasheet) is critical. A specification sheet provides the empirical data required to determine compatibility, energy efficiency, and photometric performance. This article serves as a comprehensive guide to interpreting the technical parameters of LED tube lights, ensuring the correct selection for commercial, industrial, and residential applications.

Electrical Characteristics

The electrical section of a specification sheet defines how the LED tube interacts with the power grid and the existing fixture's infrastructure.

Input Voltage and Frequency

This parameter indicates the range of voltage the LED driver can accept.

Wide Voltage Range:High-quality LED tubes often support a wide input voltage (e.g., 100-277V AC or 120-347V AC). This is crucial for international projects or facilities with unstable power grids^［2］.
Frequency:Standard operation is typically at 50/ Hz.

Power Consumption (Wattage)

Measured in watts (W), this indicates the energy consumed by the tube.

Efficiency Comparison:A standard 4-foot T fluorescent tube typically consumes 32W to 40W. An equivalent LED tube usually consumes between 14W and 18W, offering energy savings of approximately 50-60%^［3］.
Efficacy:This is the ratio of light output to power input, measured in lumens per watt (lm/W). Modern commercial LED tubes typically range from 10 lm/W to 1 lm/W.

Power Factor (PF)

The Power Factor represents the efficiency of the electrical device in utilizing current.

Definition:It is the ratio of real power (used to do work) to apparent power (supplied by the utility).
Significance:A PF of >0. is considered high quality. A low power factor (<0.5) can cause inefficiencies in the building's electrical distribution system and may result in penalties from utility companies for commercial users^［4］.

Total Harmonic Distortion (THD)

THD measures the harmonic distortion present in the current waveform. Lower THD (typically <20%) indicates a cleaner power draw, reducing the risk of overheating neutral wires and interfering with other sensitive electronics in the facility^［5］.

Photometric Data

Photometrics describe the quantity and quality of light emitted by the tube. This is often the most scrutinized section for designers ensuring visual comfort and compliance with lighting standards (such as IESNA or EN12464).

Luminous Flux

Measured inlumens (lm), this is the total amount of visible light emitted by the source.

Note:Do not confuse Lumens with Watts. Watts measure energy used; Lumens measure light output. When replacing fluorescent tubes, match the lumens, not just the wattage.

Correlated Color Temperature

CCT describes the color appearance of the light itself, measured inKelvin (K)^［6］.

JENLIGHTING representatives engaging with clients during the exhibition

3000K (Warm White):Similar to halogen or incandescent light; used in hospitality or residential settings.
4000K (Cool White/Neutral):The standard for offices, retail, and schools. It mimics natural morning light.
5000K - 6000K (Daylight):Bluish-white light, often used in warehouses, hospitals, and security lighting for high alertness and visibility^［7］.

Color Rendering Index

The CRI measures the ability of the light source to reveal the colors of various objects faithfully in comparison with a natural light source^［8］.

Scale:to 100.
Standard:> is standard for general commercial use (offices, warehouses).
High Fidelity:> is required for retail, art galleries, and hospitals where accurate color discrimination is vital.

Beam Angle

Unlike fluorescent tubes which emit light at 360° (requiring a reflector to direct light down), LED tubes are directional.

Typical Range:120° to 330°.
Selection:A 180° or 240° beam angle is common for troffer lights and general area lighting to ensure uniform distribution without dark spots^［9］.

Installation and Retrofit Types

One of the most critical sections of the specification sheet is the installation method. Selecting the wrong type can lead to fixture damage or safety hazards.

Type A: Plug and Play (Ballast Compatible)

These tubes are designed to work with the existing fluorescent ballast.

Pros:Easiest installation; simply remove the old tube and insert the new one.
Cons:If the ballast fails, the tube will not work. Energy savings are slightly lower due to ballast power consumption^［10］.

Type B: Ballast Bypass (Direct Wire)

These tubes require the existing ballast to be disconnected, and the line voltage (AC mains) is wired directly to the sockets.

Pros:Higher reliability (no ballast to fail) and maximum energy efficiency.
Cons:Requires a certified electrician to rewire the fixture. Safety labels must be applied to the fixture to warn against installing fluorescent tubes later^［11］.

Type A+B: Hybrid

These tubes can operate with a ballast or without it. They offer flexibility for maintenance but are generally more expensive than Type A or Type B specific tubes.

Type C: External Driver

The tube operates off a remote LED driver (similar to low voltage MR1 lamps). This is less common for standard tube retrofits but offers high performance and dimming capabilities^［12］.

Physical and Mechanical Specifications

Dimensions and Diameter

The "T" in T and T1 stands for "Tubular," and the number represents the diameter in eighths of an inch.

T8:8/ inch = inch diameter (Standard for modern LED retrofits).
T12:12/ inch = 1. inch diameter (Older technology, phasing out).
Length:Standard lengths include 2ft (600mm), 4ft (1200mm), 5ft (1500mm), and 8ft (2400mm)^［13］.

Base Type

G13:The standard bi-pin base for T and T1 tubes (pins are 13mm apart).
G5:The standard bi-pin base for T tubes (pins are 5mm apart).
FA / R17D:Single-pin bases often used in high-bay applications or 8ft shop lights^［14］.

Housing Material

Glass:Traditional, offers high clarity but is fragile.
Polycarbonate (PC):Shatterproof, making it ideal for food processing plants, schools, and gyms.
Glass/PC Hybrid:A glass tube with a PC coating to diffuse light and provide some shatter resistance.

Environmental and Lifespan Ratings

Operating Temperature

This specifies the ambient temperature range in which the LED tube can safely operate.

Standard:-20°C to 45°C.
Cold Storage:Specialized tubes can operate in temperatures as low as -40°C, making them suitable for freezers and cold storage warehouses^［15］.

L Lifespan

Unlike incandescent bulbs that "burn out," LEDs degrade over time.

Definition:L refers to the number of operating hours until the light output drops to 70% of its initial brightness.
Standard:A typical high-quality LED tube is rated for50,00 hours. If used 1 hours a day, this equates to over 1 years of service^［16］.

Ingress Protection (IP Rating)

IP20:Standard indoor use (protected against fingers, not water).
IP65:Dust tight and protected against water jets. Essential for car washes, outdoor canopies, or damp locations^［17］.

Summary Table: Specification Checklist

Parameter	Standard Commercial Spec	High-Performance Spec
Wattage (4ft)	18W	15W
Luminous Flux	220 lm	260 lm
Efficacy	1 lm/W	>1 lm/W
CRI	>80	>90
PF	>0.5	>0.9
Lifespan (L70)	30,00 hrs	50,000+ hrs
Warranty	Years	Years

Conclusion

Reading an LED tube light specification sheet requires a holistic understanding of electrical compatibility, photometric requirements, and physical constraints. By prioritizing parameters such asLuminous Efficacy,Power Factor, andInstallation Type, buyers can ensure they select a product that not only fits their fixtures but also delivers long-term energy savings and visual comfort.

For those managing large-scale retrofits involvingHigh Bay Lighting,LED Panels, orLinear Strip Lights, the same rigorous analysis of specification sheets applies. Always verify that the selected LED product carries relevant safety certifications (such as UL, DLC, CE, or RoHS) to ensure compliance with local regulations^［18］.