This bulb was very hot after 1 hour of use (test). i could not unscrew it with bare hands- had to use a towel. i have a 150w lamp. is this normal?

I just checked mine. It has be on for about 5 hours. The base of the bulb was hot, but the glass was barely warm. I checked a couple of other LED bulbs, different wattage and brands, and they were all the same.

Is this an A19 or an A21 bulb?

This is an A21 LED light bulb, which has a standard E26 medium screw base, the same as A19 LED light bulb. Hence you can use these A21 LED light bulb where A19 bulbs can be used.

Can this be used in a three way fixture with an old fashoined tow rating 0f 150w?

In my 3-way older lamps, any of the new LEDs "work" but if it's a multi-level lamp/bulb then the bulb only works on the middle level (in an old 150W bulb, it'd be the 100W level of light). The middle setting on this bulb feels/looks to be brighter than the old 100W (middle setting) likely b/c LEDs are brighter.

Can I use these in a 60watt max fixture?

The "60W MAX" labeling on many household lamp fixtures concerns the heat generated by old school incandescent bulbs; using, say, a 100W incandescent bulb in a fixture rated "60W MAX" it would get way too hot. So, "60W MAX" limits the actual power used by a bulb, NOT the "light equivalent" of an LED bulb. Since these "150W" LED bulbs actually only use 20 or 23W, they are BELOW the 60W MAX rating of your fixture, and you can use these bulbs in that fixture provided A) they fit, and B) the fixture is NOT enclosed.

A21 Led Bulb 150 Watt Equivalent Super Bright Light Bulb

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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NZ$79

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Specifications

ASIN	B081GQCVK4
Accepted Voltage Frequency	100 to 120 Volts and 60 Hertz
Additional Features	20 Watt LED (150W Equivalent), Instant On, Not Dimmable, Super Bright 2300 Lumens, Warm White (CCT 2700K)
Best Sellers Rank	#2,625 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #180 in LED Bulbs
Brand	E ENERGETIC LIGHTING
Brand Name	E ENERGETIC LIGHTING
Bulb Base	E26
Bulb Shape Size	A21
Color	Soft White 2700k
Color Rendering Index	80
Color Temperature	2700 Kelvin
Connectivity Technology	Normal bulb
Control Method	Touch
Controller Type	Push Button
Customer Reviews	4.5 out of 5 stars 1,435 Reviews
Efficiency	High
Frequency	60
Incandescent Equivalent Wattage	150 watts
Included Components	Bulb included
Indoor Outdoor Usage	Indoor
Item Dimensions W x H	2.76"W x 5.43"H
Item Weight	4.16 ounces
Light Color	Soft White
Light Source Operating Life	15000 hours
Light Source Type	LED
Light Source Wattage	20 watts
Light Type	LED
Manufacturer	Yankon Lighting
Manufacturer Part Number	A21-27K-2300LM-Non
Manufacturer Warranty Description	2 years.
Material Type	Metal, Plastic
Model Number	A21-27K-2300LM-Non
Number of Items	2
Power Consumption	150 watts
Power Source	Corded Electric
Shape	Arbitrary(A)
Special Feature	20 Watt LED (150W Equivalent), Instant On, Not Dimmable, Super Bright 2300 Lumens, Warm White (CCT 2700K) Special Feature 20 Watt LED (150W Equivalent), Instant On, Not Dimmable, Super Bright 2300 Lumens, Warm White (CCT 2700K) See more
Specific Uses For Product	Home
Specification Met	FCC, UL
Style Name	150-Watt Equivalent
Unit Count	2 Count
Voltage	120 volts
Wattage	20 watts
White Brightness	2300 lumens

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