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Quizzes > Electronics & Gadgets

LED Quiz: Test Your Lighting Product Knowledge

Quick, free lighting quiz to check product know-how. Instant results.

Editorial: Review CompletedCreated By: Mohit VarmaUpdated Aug 27, 2025
Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art representing a quiz on LED Lighting Product Knowledge

This quiz helps you check your LED lighting product knowledge across types, specs, and efficiency in 15 quick questions. If you need a refresher first, try the led basics quiz, or broaden your skills with the electronics quiz. Tracking progress? Pair this test with the pre quiz for before-and-after practice.

Which LED product is typically used for applying broad-area outdoor illumination?
LED Panel
LED Tube Light
LED Floodlight
LED Filament Bulb
LED floodlights are designed to cast high-intensity, wide-beam light over large outdoor areas, making them ideal for broad-area illumination. Other LED products like tubes, panels, or filament bulbs serve different, often indoor, applications.
What does the term "lumens" measure in LED lighting?
Power consumption
Fixture lifespan
Luminous flux or total light output
Color temperature
Lumens quantify the total amount of visible light emitted by a source per unit time, indicating its brightness. It does not measure power, color, or longevity.
Approximately what is the typical rated lifespan of an LED fixture compared to an incandescent bulb?
5,000 hours for LED vs. 10,000 hours for incandescent
1,000 hours for LED vs. 50,000 hours for incandescent
100,000 hours for LED vs. 5,000 hours for incandescent
50,000 hours for LED vs. 1,000 hours for incandescent
LED fixtures commonly have rated lifespans around 50,000 hours, significantly longer than incandescent bulbs, which typically last around 1,000 hours. This large difference underscores one of LEDs' key advantages.
What is the recommended first step before installing any LED fixture?
Turn off power at the circuit breaker
Connect the driver
Mount the fixture
Power on to test terminals
Safety best practices dictate de-energizing the circuit at the breaker before starting any electrical installation to prevent electric shock. Other steps follow only after power is confirmed off.
Which description best defines energy efficiency in LED lighting?
Larger fixture size
High wattage consumption
Longer warm-up time
High lumens output per watt consumed
Energy efficiency refers to maximizing luminous output (lumens) while minimizing electrical power input (watts). Higher lumens per watt indicates better efficiency.
If an LED fixture has an efficacy of 120 lumens per watt and operates at 10 watts, what is its lumen output?
120 lumens
10 lumens
2,400 lumens
1,200 lumens
Lumen output is calculated by multiplying efficacy (120 lm/W) by power (10 W), yielding 1,200 lumens. Other answers result from incorrect multiplications.
What does the Color Rendering Index (CRI) indicate in LED lighting?
Accuracy of color appearance under the light
Flicker rate
Energy efficiency
Thermal performance
CRI measures how faithfully a light source renders object colors compared to a reference. High CRI values (close to 100) indicate more accurate color reproduction.
Which common LED product typically uses Surface-Mounted Device (SMD) technology?
COB downlight
LED strip light
Neon-style LED tube
LED filament bulb
LED strip lights use small SMD chips mounted on flexible boards to provide uniform lighting. Filament and COB types rely on different internal configurations.
An LED fixture is rated IP65. What does this signify?
Protected against splashing water only
No ingress protection
Dust-tight and protected against low-pressure water jets
Submersible up to 1 meter
IP65 denotes complete dust protection (6) and resistance to water jets (5). IP44 relates to splashes, and IP68 covers submersion.
Which factor has the greatest impact on the lifespan of an LED luminaire?
Operating junction temperature
Optical beam angle
Color temperature
Input voltage
Excessive junction temperature accelerates lumen depreciation and reduces LED lifespan. While voltage and optics are important, thermal management is paramount.
For optimal heat dissipation in LED fixtures, which material is most commonly used for heat sinks?
Wood
Glass
Plastic
Aluminum
Aluminum offers excellent thermal conductivity and is lightweight, making it the material of choice for LED heat sinks. Other materials lack sufficient conductivity.
What is "flicker" in the context of LED lighting?
Permanent color shift
Slow startup time
Rapid fluctuation of light output
Excess heat generation
Flicker refers to rapid, often imperceptible, fluctuations in light intensity from an LED source. It is unrelated to startup time or heat generation.
How does a high power factor benefit an LED lighting system?
Extends LED junction temperature
Reduces current draw and system losses
Improves color rendering
Increases luminous efficacy
A high power factor means that voltage and current are in phase, reducing reactive power and minimizing distribution losses. It does not directly affect light quality or temperature.
Which safety standard is commonly referenced for indoor LED luminaires in North America?
CE
IEC 60598
RoHS
UL 1598
UL 1598 specifies safety requirements for luminaires in the U.S. and Canada. IEC 60598 is its international counterpart, while RoHS and CE are related to environmental and general compliance.
What surge protection component is often integrated into an LED driver to guard against voltage spikes?
Capacitor
Inductor
Metal Oxide Varistor (MOV)
Resistor
MOVs clamp excessive voltage by diverting surge currents, protecting sensitive driver electronics. Capacitors, resistors, and inductors serve different circuit functions.
What does the TM-21 standard predict for LED products?
Color shift over time
Ingress protection levels
Lumen maintenance (L70) lifetime projection
Thermal resistance
TM-21 uses LM-80 test data to extrapolate the time it takes LEDs to reach 70% of initial lumen output (L70). It is not concerned with color shift or IP rating.
According to LM-80 testing, which parameter of LED modules is measured?
Lumen depreciation over a fixed period
Surge tolerance
Color rendering index
Electrical isolation resistance
LM-80 records lumen maintenance of LED modules at defined temperatures over time. CRI, surge tolerance, and insulation are evaluated by different standards.
In LED driver design, what is a typical maximum total harmonic distortion (THD) target for quality lighting applications?
Less than 50%
Less than 80%
Less than 20%
Less than 5%
High-quality LED drivers aim for THD below 20% to reduce electrical interference and improve power quality. Values above this can cause distortion in the power grid.
What torque specification is commonly recommended for tightening screws on LED terminal blocks to ensure reliable connections?
10.0 Nm
0.2 Nm
5.0 Nm
2.0 Nm
LED terminal block screws often require low torque settings around 0.2 Nm to secure wires without damage. Excessive torque risks stripping threads or deforming contacts.
What is an acceptable flicker modulation index (FMI) value to minimize perceptible flicker in LED lighting installations?
Less than 0.1
Less than 1.0
Less than 0.5
Less than 0.05
An FMI below 0.1 indicates minimal perceptible flicker for most people. Higher values may cause noticeable flicker, while extremely low values are harder to achieve cost-effectively.
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Learning Outcomes

  1. Identify different types of LED lighting products and their uses
  2. Analyse key performance metrics such as lumens and efficacy
  3. Evaluate factors affecting LED lifespan and reliability
  4. Apply installation best practices for optimal results
  5. Demonstrate understanding of energy efficiency and cost savings
  6. Master essential safety standards and compliance requirements

Cheat Sheet

  1. LED Product Types - Become an LED detective by exploring industrial fixtures, under-cabinet lights, recessed downlights, replacement bulbs, and festive holiday LEDs. Knowing each type's superpower will help you light up any space with confidence.
  2. Measuring Brightness - Learn how to measure light output in lumens and calculate luminous efficacy (lumens per watt) to determine which LEDs pack the biggest punch for your energy budget. This skill turns you into a lighting efficiency ninja, ensuring you get the most glow for your go.
  3. Maximizing Lifespan - Dive into factors affecting LED longevity, from heat management techniques to lumen maintenance and thermal design best practices. With this knowledge, you'll keep your LEDs shining bright well into the future.
  4. Savvy Installation Tips - Master installation best practices by ensuring secure connections, proper ventilation, and strict adherence to manufacturer guidelines. A smart install means fewer headaches, flawless performance, and a longer useful life for your lights.
  5. Energy Efficiency Wins - Discover how LEDs can use up to 90% less energy than incandescent bulbs and last 35 - 50 times longer, leading to serious cost savings. Your wallet and the planet will thank you for making the switch.
  6. Choosing Certified LEDs - Understand why selecting ENERGY STAR certified products ensures top-tier quality, efficiency, and industry compliance. This stamp of approval guarantees you're getting LEDs that meet rigorous performance standards.
  7. Heat Sink Heroes - Learn the role of heat sinks in LED design to efficiently dissipate heat and maintain peak performance over time. Proper thermal management keeps your LEDs cool, efficient, and long-lasting.
  8. Lumen Maintenance - Study how lumen maintenance affects the gradual decrease in light output throughout an LED's lifespan. Understanding this concept helps you predict performance and plan timely replacements.
  9. Color Temperature & CRI - Explore the significance of color temperature and Color Rendering Index (CRI) to ensure the right mood and accurate color perception in different environments. Perfect lighting tone equals perfect atmosphere!
  10. Safety & Compliance - Review key safety standards and compliance requirements for LED installations to guarantee secure, effective operation. A safe install is a successful install!
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