Since the 6W LED lights have been replaced by the 7.5W LED lights, I got back in touch with the vendor in China to understand why these new LED lights are heating so much. They measured 65°C after 30 minutes of operation which is the maximum the heat sink can cope with, so this LED light can't be used as a fog light for instance. Although, as a position/parking + stop light, it still should be fine but I haven't tested out.
The new 7.5W is based on the latest EPISTAR ES-LAHRPH24 chip which is a 24milx24mil (610um...) chip. It can deliver a luminous intensity of 3000mcd at 150mA! Very impressive.
The light has 3LED's x 4 faces + 3LED's on top behind the lens. That's a total of 15LED's.
Here's a picture comparing the recommended 6W to the 7.5W in stop light (highest brightness). As you can see, the brightness of the 7.5W is truly impressive knowing that the 6W was already at a very high level.
Microscopic view of the EPISTAR Chip
Despite the impressive 7.5W LED light, I've asked them if they can produce again the 6W LED lights. They are now building up a 6W prototype using the new LED chips and new housing and will send it to me for testing. At the end, both 7.5W and 6W will be available so that anyone can choose what suits best depending on their needs
More to come