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.

what color temp is this bulb? 2700k? 500k?

Here is the detailed information. Brand Philips Hue Item Dimensions LxWxH 2.4 x 2.4 x 4.2 inches Voltage 120 Volts Color Temperature 2700 Kelvin Item Weight 0.56 Pounds

Does the 1600 lumen white bulb allow you to change white temperatures (warm, bright, cool etc) or not ?

Be careful, Amazon has posted this question under the Philips Hue White Ambiance A21 High Lumen Smart Bulb, 1600 Lumens (can change from warm to cool white). And I assume it is also on the Philips Hue White A21 High Lumen Smart Bulb, 1600 Lumens page (cannot change white hue) since that is what comes up when I click the “answer this question” link.

Brand	Philips Hue
Light Type	LED
Special Feature	Dimmable, color
Wattage	17 watts
Bulb Shape Size	A21
Bulb Base	E26
Incandescent Equivalent Wattage	100 Watts
Specific Uses For Product	Lamp
Light Color	White
Voltage	120 Volts
Unit Count	1.0 Count
Color Temperature	2700 Kelvin
Number of Items	1
Brightness	1600 Lumen
Shape	Arbitrary(A)
Material	Glass
Model Name	Philips Hue
Indoor/Outdoor Usage	Indoor
Power Source	Corded Electric
Color Rendering Index	80
Power Consumption	6 Watts
Item Package Quantity	1
Light Source Type	LED
Item Weight	0.15 Kilograms
Light Source Wattage	6 Watts
Product Dimensions	2.63"W x 5.2"H
Accepted voltage frequency	100 to 120 Volts and 60 Hertz
Control Method	App, Voice
White Brightness	1600 Lumens
Efficiency	High Efficiency
Style	High Lumen (100W)
Global Trade Identification Number	00046677557805
Manufacturer	Signify North America Corporation
Color	White (Original)
UPC	046677557805
Light Output Maximum	1600 Lumens
Part Number	580845
Item Weight	5.3 ounces
Item model number	580845
Size	1 Pack
Finish	Soft White
Pattern	Solid
Switch Style	Dimmer Switch
Special Features	Dimmable, color
Included Components	1x High lumen Light Bulb
Batteries Included?	No
Batteries Required?	No
Warranty Description	3 years.

Philips Hue Smart 100W A21 LED Bulb - Soft Warm White Light - 1 Pack - 160LM - E26 - Indoor - Control with Hue App - Works with Alexa, Google Assistant and Apple Homekit

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