Q1How bright are led light bulbs?

Led bulbs available for standard fixtures vary in brightness from less than 50 lumens up to about 1200 lumens. The brightest led bulbs for standard fixtures are the floodlights and spotlights. The brightest of these uses about 25 watts and produces light comparable to a 120-watt incandescent.

The brightest LED bulbs with approximately the same size and shape as ordinary incandescent bulbs produce up to 600 lumens. With a few exceptions these bulbs are somewhat directional so they are most effective when pointed at the area to be illuminated.

Q2How efficient are led bulbs compared to incandescent bulbs?

The efficacy of the newer led light bulbs is more than five times higher than comparable incandescent bulbs. In other words, led light bulbs use only about 20% as much electricity to produce the same amount of light. However, because led bulbs direct a larger percentage of light where it is needed, in many applications they are as much as ten times as effective as incandescent bulbs, reducing energy use by 90%.

Q3Are bulbs with more leds brighter than bulbs with less?

The number of leds is not the determining factor of bulb brightness. Different types of leds vary greatly in size and light output. The most accurate indicators of the brightness of LED bulbs are the measured lumens or lux. Lumens measure the total amount of light output from a bulb. Lux measures how bright the light is on a surface at a specified distance.

Q4How does the brightness of led lighting compare to incandescent lighting?

Led light bulbs are much brighter than incandescent or halogen bulbs of the same wattage, but led bulbs are not available in very high wattages. Thus, when replacing incandescent or halogen lamps with led lamps, more led lamps are often needed. For example, to replace one 100-watt incandescent bulb you may need two 5-watt or 6-watt led bulbs. Although you have more bulbs you are still using 85% less electricity.

Q5Which led bulb is comparable to a standard 60 watt light bulb?

Few led light bulbs with the same size and shape as a standard 60 watt incandescent bulb are comparable in light output. The closest led bulb we have found is our A19 9W high power LED bulb.

Q6What do "cool white" and "warm white" mean, and what is CCT?

The Color Correlated Temperature (CCT) is given in the description of each of our white led bulbs. The color (CCT) of our white bulbs ranges from a warm yellow white (2700K) to a cool blue white (7000K).

By comparison, a typical incandescent bulb has a CCT of 2800K. A typical halogen is a bit higher, maybe 3500K. Daylight white is 4500K and a cool white fluorescent is 6000K or more.

The human eye adapts to background light so that even a daylight white bulb will look slightly blue in a room illuminated mainly with incandescent bulbs. Similarly, an incandescent bulb will look very yellow or even orange in midday sunlight.

Q7What is the difference between a floodlight and a spotlight?

Led spotlights output a narrower beam of light, typically less than 45 degrees wide. Most of the light from a spotlight is concentrated onto a relatively small area producing a bright spot. Led floodlights output a wider beam of light, up to 120 degrees, so the light from a floodlight is spread out over a much larger area.

Because the light is more concentrated, a spotlight will appear brighter than a floodlight but only within its narrower beam. A spotlight is more suited to illuminating objects and a floodlight is more suited to illuminating areas.