Craig,
That sounds right.
buzz brings up a bit of reality here: let's say each LED has two volts of drop across it; the LED strips I've seen all have three LEDs in common. As the oznium device brings up the voltage from zero, no LED will come on until the voltage has ramped halfway up to twelve volts! If the ramp period is two seconds, that mean you'll have to wait a second before there's any light. That doesn't sound like much but it seems unacceptable to me.
buzz,
On the other hand, if the oznium device has been designed to ramp up LEDs, maybe those guys have heard of the forward voltage drop and designed the unit so it doesn't start with zero volts but comes on at, say 5 volts and ramps from there.
On November 25, 2016 at 07:39, buzz said...
Ernie,
You'll probably have better luck at the lower levels if you start the ramp at or just below the forward junction voltage of the LED's. Otherwise, you'll have an apparent delay while the voltage ramps up from zero.
buzz is saying that you won't get any light from the LEDs until the applied voltage equals the sum of the turn-on voltages of all the LEDs, which is probably about six volts for LED strips. Ramping up to the first six volts or so, then, is literally a waste of time.
LED light output vs current is relatively linear.
And current does not flow in an LED strip until the applied voltage equals the sum of the forward voltages of the LEDs; again, about six volts.
Fortunately, if you are operating in the DC domain, you won't need to deal with crazy intensity "snap" issues associated with some phase control designs.
Right. Oznium informed me that they shipped my unit today, the day after Thanksgiving. I'll let you know what I find.
