Raveninghorde wrote:

Eeyore wrote:
Raveninghorde wrote:

Here is my new light bulb, minus reflector.

168 112 lumen leds in 14 strings.

The main problem is the aluminium of the pcb

Is that on one side ?

is not earthed causing problems with current control

What sort of problems ? Decouple every few LEDs to GND if it's HF ?

presumably due to much higher stray capacitance than we had on FR4.
Just got to find a neat way of earthing it.

So what material is that if not FR4 ?

http://www.aismalibar.com/archivos/8...pdf?download=1

Ah thanks, that might come in useful for a project a colleague and I have in mind.


p.s. 19k lumens ! What's it a replacement for ?

A light bulb Out door space lighting.

What's the current luminaire ?

Graham


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