Pulsed Lighting = more efficiency?
- Thread starter heckler73
- Start date
heckler73
Well-Known Member
Only a hardware run so far, to see if I can make it fail. I've had a circuit running on ~25% duty cycle at ~3A through two cheapo Chinese 3W whites for what seems like months now. No heatsinks on anything. However, I haven't put the scope on it since late-July/early-August, so I'm really not positive on what it is doing right now, but I see no obvious signs of failure (no flicker, dimming etc.) For now, I'm more interested in getting my "beowulf Server"
operating using constant current first, before implementing a full grow test with pulse.After all, an experiment is pointless without a control to compare against.
_MrBelvedere_
Well-Known Member
cool, keep us postedOnly a hardware run so far, to see if I can make it fail. I've had a circuit running on ~25% duty cycle at ~3A through two cheapo Chinese 3W whites for what seems like months now. No heatsinks on anything. However, I haven't put the scope on it since late-July/early-August, so I'm really not positive on what it is doing right now, but I see no obvious signs of failure (no flicker, dimming etc.) For now, I'm more interested in getting my "beowulf Server"
After all, an experiment is pointless without a control to compare against.
speedyganga
Well-Known Member
I don't know what finally happen to this pulsed led test,
But I found this:
http://www.geocities.ws/sash_elias/files/thesis1.pdf
Many thing are interesting in his work such as saying Pulsed light never did better at any frequency than continuous light.
But It also sugest there is no difference between 12 to 120Hz in growth with similar iradiation.
Then I thought why do we use Driver then ?!
A simple bridge rectifier like this one (chose randomly ^^ but seem way to strong for our need) should drive the led with a frequency of 100 or 120Hz that shouldn't bother the plants... Then voltage would be high, and I wouldn't want to use a transfo but increasing the number of led could do it isn't ?
Maybe we could reduce the cost of our lamps this way.
But I found this:
http://www.geocities.ws/sash_elias/files/thesis1.pdf
Many thing are interesting in his work such as saying Pulsed light never did better at any frequency than continuous light.
But It also sugest there is no difference between 12 to 120Hz in growth with similar iradiation.
Then I thought why do we use Driver then ?!
A simple bridge rectifier like this one (chose randomly ^^ but seem way to strong for our need) should drive the led with a frequency of 100 or 120Hz that shouldn't bother the plants... Then voltage would be high, and I wouldn't want to use a transfo but increasing the number of led could do it isn't ?
Maybe we could reduce the cost of our lamps this way.
Resinhound
Well-Known Member
Im interested in seeing how we are going to generate these 5000umols.