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.

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Description

🌈 Light smarter, live brighter — your space, your vibe!

COLOR YOUR WORLD - Access 16 million colors plus warm-to-cool whites to perfectly match your mood or decor.
AUTOMATE YOUR AMBIANCE - Sync with Hue Bridge for remote access, routines, and smart home integration using Matter.
SEAMLESS SMART CONTROL - Control your lighting hands-free via Alexa, Google Assistant, Apple HomeKit, or the Hue app.
DESIGNED FOR EVERY SPACE - Fits standard E26 sockets and dims smoothly to create the perfect atmosphere anytime.
ILLUMINATE WITH BRILLIANCE - 1600 lumens of vibrant, energy-efficient LED light brightens any room with ease.

The Philips Hue Smart 100W A21 LED Bulb delivers 1600 lumens of customizable white and color light with energy-efficient 16W power consumption. Compatible with Alexa, Google Assistant, and Apple HomeKit, it offers seamless voice and app control. Enhance your home with millions of colors, preset scenes, and smart automation via the Hue Bridge and Matter protocol, all in a standard E26 bulb designed for indoor use.

Specifications

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
Light Color	White and color light
Voltage	1 Volts
Unit Count	1.0 Count
Number of Items	1
Brightness	1600 Lumen
Shape	a21
Material	Synthetic Polymer (PMMA)
Model Name	Hue Smart Bulb
Indoor/Outdoor Usage	Indoor, Outdoor
Color Rendering Index	16
Power Consumption	100 Watts
Item Package Quantity	1
Light Source Type	Led
Light Source Wattage	16 Watts
Product Dimensions	2.8"W x 5.2"H
Control Method	App, Remote, Touch, Voice
Style	High Lumen (100W)
Manufacturer	Signify North America Corporation
UPC	046677562984
Part Number	562982
Item Weight	6.4 ounces
Item model number	562982
Color	White and Color Ambiance
Included Components	1x A19 Bulb
Maximum Compatible Wattage	100 Watts
Special Features	High Lumen (100W)
Switch Style	Dimmer Switch
Batteries Included?	No
Batteries Required?	No
Wattage	16 Watts
Average Life	25000 Hours

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