for a floor lamp to emit brightness for reading, etc., , what is appropriate cool light or daylight?

Depend on your light color preference. Lighting color is measured in degree Kelvin _the lower number 2700K is the light color of an incandescent soft white bulb with more yellow light and the high number daylight 6500K is a brighter blue light. Cool White 4100K is the color of most the bright ceiling lighting in retail stores and offices. Some people feel the high K bulbs is harder on the eyes. Google a Kelvin light chart and use the number valve to guide you. The color names get confusing. Also check the chart on the packaging. High watts will generate more lumens. Lumen and Kelvin color are not directly related but there is a relationship. Read about photography light if are concerned about the color of your pictures and reflected light. Educate yourself and then experiment.

Will a 2-way socket work with a 3-way bulb?

May you be confused by the way normal household lighting is wired. Don't believe there is a 2 way medium base bulb (lamp). The bulb need a 3-way light socket to work at the three lighting levels but the lamp socket normally functions off of two wires for a simple setup like a table lamps. This is called a two wire circuit but could have a third ground wire (green or bare). The bulb has 2 hot contacts points on the base for a low and med setting and both are engaged for the high level. The turn knob switch on the socket changes the lighting level and has 4 positions _ off-1-2-3. LED lights do not work with normal (older) dimmer switches but do work with 3 way or 4 way wall switches that are wired together like in a dining room or with stairs switches. A 3-way wall switch still works if the bulb is installed in and controlled in a normal 3 way (level) light socket but only control electrical power to the fixture. These bulbs are digital vs filament but for simplicity they work the same for different light levels. A 3-way wall switch is for two wall switch locations and a lamp fixture(s). The wiring for two or more wall switches controlling a single light can be confusing and have numerous wiring configurations. Google 3-way light switch wiring for layout options. If a 3 way wall switch has been replaced and it is not uncommon for one leg of the switch to not work properly, if a switch wire has been reinstalled on a wrong terminal screw. Not all wall switches are laid out the same. Troubleshoot with the wiring layout diagram. Summary - generally the lamp lighting level is controlled by the socket multi-position switch knob and the wall switch however configured controls power to the wall outlet or light fixture. Hope this helps.

Are the 3way A21 bulbs compatibility with alexa

That answer by the company doesn’t appear to be completely true. I have several 3 way compatible lights and this bulb works in some but not others. I have asked the company for more information.

What is the difference between cool light and daylight?

Thanks for asking. Cool White is 4000K and Daylight is 5000K. Everyone perceives light slightly differently and it's mostly personal preference. If you search the internet for this topic, you will see a lot of information on how to choose colors. Remember that the specification for color is the numeric value such as 2700K, 3000K, 4000, 5000K, etc. Terms such as warm, soft, bright, cool, daylight vary from one company to another. So when you are shopping for the color, use the numeric value.

Brand	Great Eagle Lighting Corporation
Manufacturer	Great Eagle Lighting Corporation
Product Dimensions	13.89 x 7.14 x 7.14 cm; 0.28 g
Item model number	2A213W1930A
Part Number	2A213W1930A
Number of Items	2
Colour	3000k (Soft White)
Shape	Bulb
Material	copper
Finish types	Clear
Voltage	120 Volts
Specific Uses	General purpose
Special features	3-Way
Light Direction	Adjustable
Power and Plug Description:	Corded Electric
Batteries included?	No
Batteries Required?	No
Type of Bulb	LED
EU Energy Efficiency Label	Highly Efficient
Luminous Flux	2150 Lumen
Wattage	19 watts
Wattage	150 Watts
Incandescent Equivalent	150 Watts
Colour Temperature	3000 Kelvin
Colour Rendering Index (CRI)	80
Average Life	22 Years
Item Weight	0.28 g
Guaranteed software updates until	unknown

Great Eagle 50/100/150W Equivalent 3-Way A21 LED Light Bulb 3000K Soft White Color (2-Pack)

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