LED directly on a heatsink

Aviator · 2019-12-09T13:09:18.000Z

Hi everybody.
I’m planning on build a bicycle light with a XHP35 HI on a Opulent Americas starboard and a 40mm Aspheric Acrylic Lens with 16mm focal length. The led will be mounted a little bit further for a wider beam while exactly on the focus I’ will put a straight iris to cut a small part of the upper beam that bother the opposite traffic or people walking. I decide to build this lamp myself because there is no commercial solution that has a simil beam pattern.

But now I found this LED from Osram Oslon Blackflat

dammedia.osram.info

KW%20H5L531.TE_EN.pdf

It has 5 emitters in a row for a total of 5,5mm x 1mm, 1400 to 2200lm, 15w absorption. It would be perfect behind an aspheric lens in beam pattern.
But the led comes without any starboard and I don’t know where to find a proper one nor how to flow one.

The question is: can I stick directly as-is on a adhesive heat sink or the electric insulating adhesive film has too much thermal resistance for the small pads of the led?
Any idea on how to solve the problem?

Thanks

snakebite · 2019-12-09T13:34:54.000Z

that part must have a custom mcpcb with isolation.
if a 12v line array is what you want an altilon 1x4 will be much easier to work with.
just add compound and screw it to the heatsink.altilon
there is a samsung part that is roughly equivilant.
i have some of each and have used them in projects.

Agro · 2019-12-09T14:01:33.000Z

See the “Building the pillar” section of this mod.
You could use a similar technique to mount your LED in a thermally-good way.