What Is LED Lighting?
LED lighting (Light Emitting Diode), is a modern lighting technology that uses the emission of light as a result of semiconductor chips being stimulated by electric current. Unlike traditional incandescent bulbs and fluorescent lamps, LEDs convert electricity directly into light; the amount of energy lost as heat is very low. In this way, they produce the same luminous flux (lumens) with 75–85% less electricity and offer a lifespan between 25,000 and 100,000 hours. From industrial facilities to homes, from street lighting to retail stores, they have replaced traditional lighting technologies in every field.
How Does LED Work?
Inside an LED diode, there are p-type and n-type semiconductor layers. When current is applied at the junction of these layers, electrons drop in the energy band and emit a photon (a particle of light). Depending on the type of semiconductor material used, the color of the emitted light changes:
- InGaN (Indium Gallium Nitride): Blue and green LED
- AlGaInP: Yellow, orange, and red LED
- White LED: Obtained by applying a yellow phosphor coating over a blue chip
LED chips are powered with constant current through an electronic circuit called a driver. A properly designed driver directly affects the LED’s lifespan and color quality.
Advantages of LED Lighting
- Energy Savings: 50% less energy than fluorescents, 85% less than incandescent bulbs.
- Long Lifespan: Average lifetime of 50,000 hours (~13 years with 10 hours of use per day).
- Instant On: No warm-up time like fluorescent or metal halide.
- Contains No Mercury or UV: Environmentally friendly, safe for museums and food areas.
- Directional Light: Lossless lighting with reflectors and lenses.
- Dimmable: Stepless dimming between 0–100% (DALI, 0-10V, PWM).
- Low Maintenance: No need for periodic lamp replacement thanks to long life.
- Smart Control: Integrates with IoT, sensors, and scene management systems.
What Are Lumen, Kelvin, and CRI?
- Lumen (lm): The total amount of light produced by the luminaire. In the past, people looked at Watts; with LEDs, lumens should be the basis.
- Kelvin (K): The color of the light. 2700–3000K warm white (residential), 4000K daylight (office), 5000–6500K cool white (factory, workshop).
- CRI (Color Rendering Index): Color accuracy index (1–100). CRI ≥80 is required for offices and stores; CRI ≥90 is required for museums and healthcare facilities.
- Lumen/Watt efficacy: A good industrial LED should produce at least 130–180 lm/W.
LED Luminaire Types and Areas of Use
| Luminaire Type | Watt | Application Area |
|---|---|---|
| High Bay LED | 100-240 W | Factory, warehouse, sports hall (6–15 m height) |
| LED Floodlight | 30-1000 W | Construction site, stadium, facade, parking lot |
| LED Street Luminaire | 50-250 W | Street, road, park lighting |
| LED Panel Luminaire | 18-72 W | Office, classroom, shopping mall, hospital |
| Sealed (Vapor-Tight) LED Luminaire | 18-72 W | Parking lot, cold storage, workshop (IP65) |
| LED Linear Luminaire | 20-80 W | Under supermarket shelves, corridor |
| LED UFO Luminaire | 100-200 W | Industrial high bay alternative |
DOA Enerji LED Lighting Products
DOA Enerji Aydınlatma manufactures TS EN, CE, RoHS-certified LED luminaires using Philips Lumileds, Osram Oslon, and Bridgelux LED chips. Its fire-resistant (IP65/66/67), corrosion-resistant, and 5-year warranty product range includes street luminaires, floodlights, high bays, panel luminaires, and special project solutions. Free lighting design service with Dialux is provided.
Frequently Asked Questions (FAQ)
What is the difference between LED and fluorescent?
While LED uses semiconductor technology, fluorescent works with mercury vapor and a phosphor coating. LED is 50% more efficient, lasts 5 times longer, contains no mercury, and turns on instantly. While fluorescent ballasts fail, the LED driver is much more reliable.
Is the LED luminaire lifetime really 50,000 hours?
Quality LED luminaires last 50,000–100,000 hours under the L70/B10 standard. The L70 value indicates the time during which the luminaire maintains 70% of its initial luminous flux. In cheap LEDs, lifespan can drop below 10,000 hours due to inadequate driver and thermal management.
What should I look at instead of Watt for an LED luminaire?
Look at the lumen (lm) value and lumen/Watt (lm/W) efficacy. While a 100 W fluorescent produces ~5,000 lm, a 50 W modern LED can produce 8,000–9,000 lm. The correct comparison is made only based on lumens.
What Kelvin LED is suitable for an industrial facility?
For areas requiring high attention such as factories, warehouses, and workshops, 5000–6500K (cool white) is recommended. For offices and stores, 4000K (daylight) is preferred; for homes, 2700–3000K (warm white) is preferred.
In how many months does an LED lighting investment pay back?
When switching from fluorescent to LED, the average payback period is between 8–18 months. In high-ceiling industrial facilities, it can drop to as low as 6 months. The calculation is made with the formula: annual energy savings + maintenance savings / investment cost.