What do we need to know before purchasing an LED?
The amount of energy consumed by a light source.
"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
"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.
Refers to the energy efficiency of the bulb. The higher the lumen output per watt, the more efficient the bulb is.
LED bulbs have longer life-spans compared to traditional light bulbs. They last up to 50.000 hours.
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.
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
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.