Will this simple op-amp circuit work?

[Thane of Cawdor]

Thanks for the response!

"6-7V", those are only two dies in series...

Isn't the LED a 12V version as stated in the description or is that the actual voltage per LED in the COB die? 

[T3sl4co1l]

Well, who fuckin' knows, because there's no PDF for it, really...

At the description it says

LED Bulbs
Beam Angle(°): 60°
Color: White
Certification: CCC
Length: 0.71m
Voltage: 12V
Number of LED Chip: 1 pcs
Shape: Other
Base Type: Other

1 chip (die) is obviously false for anything other than 3-4V, so we know one of these is wrong.

The other description below this says...

Features:
 
Brand new and high quality.
 
High power super bright LED light
 
Type: COB LED
 
Power: 4.8W
 
Voltage: 6~7V
 
Current: 500mA
 
Luminous Flux: about 320~340LM
 
Color Temperature: 2900-3200K
 
Emitting Color: Warm white
 
Long service life LED
 
Great for making light sources for video camera, fish tank, decoration light
 
COB LED is less thermal resistance:
 
Among different LED components such as high power LED, SMD, dip etc, COB LED is best in less thermal resistance and cooling.
 
Size: 5cm x 0.7cm - 1.97inch x 0.28inch
Package Included:
 
1 x 4.8W COB LED Light Warm White

Which is all kinds of more inconsistent.  6-7V at 500mA is 3-3.5W, not 4.8W.

So, take your pick.

There's no sign of onboard resistors, so they aren't going to take 12V-as-in-constant-voltage-power-supply.

Probably you can run them at 700mA (which would give around 4.8W), and whatever voltage they actually operate at, burn them out quickly, and buy more replacements when needed.

If you actually want good quality spectrum / CRI, reliable data and long lifetime, buy some legitimate brand name Cree or etc. parts.  They'll be expensive, and you'll never have to replace them (assuming your thermal design is sufficient).

Tim