On Thu, 25 Jun 2009 11:40:39 +0100, Raveninghorde raveninghorde@invalid
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 not earthed causing
problems with current control presumably due to much higher stray
capacitance than we had on FR4. Just got to find a neat way of
earthing it.


Is there not a current limit resistor at each LED?

Capacitance has an effect? Improper design then.

Current limit resistors ARE the cheapest, most efficient "current
control".