Note: I have no relation to the following company beyond having bought two of their bulbs.
I ran across another new LED. It's from a US company "Nexxus Array Lighting". The 12v G4 bulb is very small with a claimed 85 lumens at 1.2 watts. Bean width is 90 degrees. Most impressive is that they cost $8.95 each here:
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In the attached picture the Array bulb is the rectangular one. The round one is an Imtra 10w equivalent bulb. Nexxus claims that their bulbs do a better job at heat management by attaching a small wire radiator directly to the back of each LED instead of using a single
large piece of heat sink metal for the whole fixture.
The other picture is not very scientific but shows the Nexxus bulb on the right and a new SCAD Sensibulb on the left (which I consider the gold standard). To my eye the Nexxus is not quite as bright as the SCAD but it's very close. Both have a very pleasing warm color. I preferred the Nexxus color to the Imtra bulb. Brightness was about the same between those two. All three were "warm" color.
These bulbs are sold for commercial
use so I was concerned that they would require tight voltage regulation. One of their engineers replied in an email
to me that they would expect little if any decrease in the 20,000 hour lifespan with voltages as high as 15v.
Another interesting aspect is that the bulbs can be dimmed with standard dimmers.
As I say, I know nothing about this company or it's products. Before I buy a bunch of these bulbs, I'd love to hear some other experiences.