© 2019 by technolamp

What to consider when buying LED bulbs

August 14, 2017

 

What do we need to know before purchasing an LED? 

 

 

Watt

The amount of energy consumed by a light source. 

 

 

Lumen

"A unit of luminous flux, a measure of the total quantity of visible light emitted by a source." 

The total amount of visible light. The higher the lumen output, the greater the amount of light spread over a larger area. 

 

Incandescent - LED - Lumen Output                                              

25W   -   3W   -   250 lm                                                                        

40W   -   5W   -   450 lm

50W   -   7W   -   500 lm

60W   -   9W    -  800 lm                                                                                                              

75W   -   12W  -  1100lm

100W -   20W  -  1600 lm

 

 

Candela

"A unit of luminous intensity, luminous power per unit solid angle emitted by a point light source in a particular direction."  

The light intensity from any point in a single direction from the light source. Compared to lumens, candelas focus in single directions, points, and beam.  

 

 

LM/W

Refers to the energy efficiency of the bulb. The higher the lumen output per watt, the more efficient the bulb is. 

 

 

Life-span

LED bulbs have longer life-spans compared to traditional light bulbs. They last up to 50.000 hours. 

 

 

CRI

Color rendering index, measures the ability of a light source to reveal the colors of objects in comparison with an ideal or natural light source or the sun. This is measured in a scale from 0-100, 100 indicating that the colors under that bulb appear the same as they would appear under direct sunlight.

CRI>90 is recommended for retail applications.

 

 

CCT

Is the color temperature measured in Kelvin. Bulbs offer a range of colors, the lower the Kelvin, the warmer (yellower) the light will be. 

 

Warm white 2700-3000K - Most similar to incandescents, offers a relaxing and warm light

Neutral white 3500-4100K - Energetic, good for retail applications

Day - cool white 5000-6500K - Refreshing light, enhances the blue color. Ideal for office, school, hospitals

 

 

IP 

Ingress Protection. This classification tells against what lamps & luminaires are protected. 

 

IP20 - Dust proof

IP21 - Dripping water

IP23 - Spraying water

IP44 - Splashing water

IP54 - Dust + splashing water

IP65 - Powerful water jets

IP67 - Dust proof + immersion for 30 min. 

IP68 - Dust proof + long periods of immersion

 

 

Dimmable or non-dimmable? 

Non dimmable bulbs can not work with dimmers. Dimmable bulbs on the other hand, can be adjusted and dimmed. You can control the light.

 

 

 

 

 

 

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