How dim can these get quantitatively? Do these go down to 1%, or only 10% or 20% before the next step is just off?

Coming from someone in the industry, retrofit lamp dimming generally has less to do with the bulb and more to do with the dimmer. Some lighting control companies will have a list of products they have tested with their dimmers and how far it will dim down. You can expect with most dimmers 5-15%, higher end dimmers from more reputable companies will probably more consistently get you to 5% maybe to 1%. Electronic low voltage dimmers generally work better with LED's, if you have an older dimmer from the days of incandescent you probable will be looking at 15% and then off.

What is the difference between "title 20 compliant" and not? They seem identical: same lumens and wattage, but priced wildly differently.

Well, the title 20 compliance is for California only. If you don’t live in California you don’t need to buy them. Besides that’s a six pack. The other one is a four pack and that’s the one I bought. They’re dimmable, warm glow. I really enjoy them, they’re so easy on your eyes. For you I would recommend this one.

Will bulbs turn off completely when using a dimmer? some led bulbs remain on slightly.

That's more about the dimmer than about the bulb. If the dimmer shuts off completely, the bulb shuts off completely. If the bulb requires more power than the dimmer's lowest setting to put out a meaningful amount of light, then it will appear off. We just use dimmers to adjust light level and use the dimmer switch's switch function to turn on and off. If I turn the dimmer all the way down, these are still lit softly, that's our specific dimmers (Lutron toggle dimmers).

Brand	Philips
Light Type	LED
Special Feature	Commitment to Sustainability with all packaging to contain on average more than 8% recycled paper, Dimmable, Dims to a Warm Glow, Eye-Friendly, See True Colors with Ultra Definition
Wattage	60 watts
Bulb Shape Size	A19
Bulb Base	E26
Incandescent Equivalent Wattage	60 Watts
Specific Uses For Product	Light
Light Color	Soft White
Voltage	120 Volts
Unit Count	4.0 Count
Color Temperature	2200 Kelvin
Number of Items	1
Brightness	800 Lumen
Shape	Shape
Material	Glass
Model Name	8A19/PER/UD/FR/G/E26/WGD 4/4PFT20
Indoor/Outdoor Usage	Indoor, Outdoor
Power Source	Corded Electric
Color Rendering Index	95
Power Consumption	8 Watts
Item Package Quantity	1
Light Source Type	led
Item Weight	0.19 Kilograms
Light Source Wattage	8 Watts
Product Dimensions	2.36"W x 4.13"H
Bulb Diameter	4.13 Inches
Control Method	App
Average Life	15000 Hours
White Brightness	800 Lumens
Style	60W
Global Trade Identification Number	00046677576110
Manufacturer	Signify North America Corporation
Color	Soft White (2700k)
UPC	046677576110
Light Output Maximum	800 Lumens
Part Number	576116
Item Weight	6.6 ounces
Item model number	576116
Size	4 Pack
Finish	Frosted
Pattern	60W
Special Features	Commitment to Sustainability with all packaging to contain on average more than 8% recycled paper, Dimmable, Dims to a Warm Glow, Eye-Friendly, See True Colors with Ultra Definition
Included Components	LED A19 Light Bulbs (4)
Batteries Included?	No
Batteries Required?	No
Warranty Description	‎3 year manufacturer warranty.

PHILIPS LED 60W A19 4-Pack Ultra Definition Soft White (2200K) 800 Lumen (8W=60W) Dimmable Flicker Free Light Bulbs

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