Call me a skeptic on this one. 
I've made it a goal to change out all the lights in my house to LED. I've been doing a great job. I've got some cool LED bedroom side table lights and floor lamps. I've also got some nice outdoor Philips LED flood lights.
Philips A21 Bulb
But when I took a look at these Philips A21 Bulbs, they are described as throwing off a "Warm White Light," but hen you look at them, they're YELLOW. 
How could this work?
I decided to replace one CFL with an LED as a test. 
THE TEST: CFL vs LED
Bulb in lamp looking all yellow. 
BEFORE with CFL:
AFTER with LED:
In daylight. 
Wow. 
I'm impressed.
Here's what the Philips LED looks like when it's turned on, no more yellow:
Life Based on Three Hours/Day: 22.8 Years. 
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Nokia Disclosure: 
Photos taken with Nokia Lumia 1520. CC BY-NC-SA  Thanks @NokiaUS for the review unit.  
Photos taken with Nokia Lumia 1520. 
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