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 LED
Light Type	LED
Special Feature	Dimmable, Energy Efficient
Wattage	100 watts
Bulb Shape Size	A21
Bulb Base	E26
Incandescent Equivalent Wattage	100 Watts
Specific Uses For Product	Decoration
Light Color	Soft White
Voltage	120 Volts
Unit Count	2.0 Count
Color Temperature	1600 Kelvin
Number of Items	1
Brightness	1600 Lumen
Shape	Arbitrary(A)
Material	Glass
Model Name	PLC 12.5W(100W) A21 SW WG LED UDF 2PK
Indoor/Outdoor Usage	Indoor
Color Rendering Index	95
Power Consumption	100 Watts
Item Package Quantity	1
Light Source Type	LED
Item Weight	6.24 ounces
Light Source Wattage	13.5 Watts
Product Dimensions	2.76"W x 5.24"H
Control Method	App
Average Life	15000 Hours
White Brightness	1600 Lumens
Efficiency	High
Style	2 Count (Pack of 1)
Manufacturer	Signify North America Corporation
Color	Soft White (2700k)
UPC	046677573669
Light Output Maximum	1600 Lumens
Part Number	573667
Item Weight	6.2 ounces
Item model number	573667
Size	2 Count (Pack of 1)
Finish	Clear,Soft White
Pattern	Ultra Definition - Clear
Special Features	Dimmable, Energy Efficient
Included Components	2 A21 Bulbs
Batteries Included?	No
Batteries Required?	No
Warranty Description	3 year manufacturer warranty.

A21 Ultra Definition Dimmable LED Light Bulbs - Flicker-Free 100w Light Bulbs with EyeComfort Technology - Soft White 2700K Lightbulb - 1600 Lumen - E26 Base - 2 Pack

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