do you need a hub to connect these to alexa?

I have one that came with my Echo Show 10, it paired with the Echo Show and the other Echos can control it no issue. But you have to have an Echo with Zigbee function - that means the older Echo Plus, or the new 4th gen Echo or an Echo Show 10. If not, you'll need to use Hue's hub and use the Hue skill to link to your Alexa network. Of the choices, I recommend the show, because it gives you visuals when installing. however most my smart devices are wifi using the Smart Life app and intergrate using that skill.

Can you change it to cool white?

It depends on which model you’re looking at. I’m seeing your question on the “White Ambiance” hue listing, which DOES adjust between warm and cool white. They do sunrise and sunset gradients well, there’s a really neat pale “moonlight” mode, and you can get a spa-like blueish white if you like. The “Soft White” hue bulbs are just a warm light similar to traditional incandescent bulbs. Both kinds of lights can use smartphone settings to dim the lights, turn on and off on a schedule, and be grouped into rooms or zones (like all your upstairs lights), and turn on/off when you arrive/leave home. Ambiance are my favorite… I don’t use the colors on my other bulbs much, but these have all the smart features and can be relaxing or mood-lifting like seasonal depression treatment lights. The basic “soft white” lights are still nice, especially for a little lamp where you wish to dim the light comfortably or not have to reach for an awkward switch.

Do these bulbs use zigbee or bluetooth to connect alexa devices? description mentions echo dot (3rd gen) which does not include zigbee hub.

I'm not entirely sure which Dot i have, it's not the cloth one though i think the previous gen, but it works with these lights even through a floor. I have it down in my kitchen and according to the app it's connected to the echo dot in my office upstairs! I have 2 Echo Flexs downstairs that are closer but their bluetooth might be weaker? My place isn't big so they're not too far away, but it does work through a floor and wanted to make sure that was mentioned. Your mileage may vary!

Can anyone explain what you mean when you say you need a hub to connect to Alexa?

The hue hub directly controls the bulbs (one hue hub can control 50? bulbs). Alexa can install a “skill” (an app/program) that communicates with the hue hub. The end result: You say “alexa turn on bedroom light", Alexa passes the request to the hue hub, hub turns the light on, Alexa gets a reply that the request was fulfilled and lights are on. You can control the hue hub directly with an app, or you can use an apple or google smart device to do the same thing that alexa does.

Brand	Philips Hue
Light Type	LED
Special Feature	High Lumen (100W)
Wattage	16 watts
Bulb Shape Size	A21
Bulb Base	E26
Incandescent Equivalent Wattage	100 Watts
Voltage	1 Volts
Unit Count	1.0 Count
Number of Items	1
Brightness	1600 Lumen
Material	Synthetic Polymer (PMMA)
Model Name	Hue Smart Bulb
Indoor/Outdoor Usage	Indoor
Power Source	Corded Electric
Color Rendering Index	16
Item Package Quantity	1
Light Source Type	Led
Specification Met	Energy Star
Item Weight	8.32 ounces
Light Source Wattage	16 Watts
Product Dimensions	2.8"W x 5.2"H
Accepted voltage frequency	100 to 240 Volts and 50 Hertz to 60 Hertz
Control Method	App, Remote, Touch, Voice
Average Life	25000 Hours
White Brightness	1600 Lumens
Efficiency	High Efficiency
Style	Original
Global Trade Identification Number	00046677562984
Manufacturer	Signify North America Corporation
Color	White and Color Ambiance
UPC	046677562984
Light Output Maximum	1600 Lumens
Part Number	562982
Item Weight	8.3 ounces
Item model number	562982
Size	1 Pack
Pattern	Smart Bulb
Switch Style	Dimmer Switch
Special Features	High Lumen (100W)
Included Components	1x A19 Bulb
Batteries Included?	No
Batteries Required?	No
Warranty Description	2 year manufacturer.

Philips HueSmart 100W A21 LED Bulb - White and Color Ambiance Color-Changing Light - 1 Pack - 1600LM - E26 - Indoor - Control with Hue App - Works with Alexa, Google Assistant and Apple Homekit

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