Airwalker16
Well-Known Member
You only got 1ft pcbs available I'm guessing?
The far red thread
- Thread starter Rahz
- Start date
BOBBY_G
Well-Known Member
well i wanted it longer but thats a start, what kinda pricing?
welight
Well-Known Member
we can make any board size you want, these are one of our standard boards
Cheers
Mark
welight
Well-Known Member
Airwalker16
Well-Known Member
Yes he wants 3 led in a 2ft board. 1 on each end and 1 on center at 12"
Fastslappy
Well-Known Member
yeah i'd do 3 on each bar , that's spread I could live with then daisy chain as needed
Airwalker16
Well-Known Member
lol our posts are so similar. That made me laugh.
Fastslappy
Well-Known Member
3 on a 2ft bar would do me I could do 1 per sq/ft
BOBBY_G
Well-Known Member
growmaus's vid for those who havent seen it
that tiny driver (http://shop.stevesleds.com/Meanwell-LDD-700H-Driver-654681631.htm) can do up to 24 at 700 mA (and they make a 1000 mA version as well!
the caveat being your input voltage has to be higher than your output so you end up with a handful of old cell chargers or throw down $20 or less for a decent AC>DC power supply
why cant we build a little capacitor circuit that charges all day and then fires for 10 min after power goes out?
that tiny driver (http://shop.stevesleds.com/Meanwell-LDD-700H-Driver-654681631.htm) can do up to 24 at 700 mA (and they make a 1000 mA version as well!
the caveat being your input voltage has to be higher than your output so you end up with a handful of old cell chargers or throw down $20 or less for a decent AC>DC power supply
why cant we build a little capacitor circuit that charges all day and then fires for 10 min after power goes out?
hyroot
Well-Known Member
Listen here you piece of shit I had to work all day. I don't have time to sit on here all day like you
If you read those nasa links air provided. It would explain why you are wrong. Uvb is only a very small percentage of it gets through the ozone layer and because of the ozone layer there's only uvb hitting the grounds surface in certain areas. The most uvb hitting the grounds surface is where the hole in the ozone layer is. No fuck off. Mic dropped.
testiclees
Well-Known Member
"Listen here"? Idiot who the heck listens to you?
UVB radiation effects the planet. Dont be a willfully ignorant cretin.
hyroot
Well-Known Member
Yeah it has an affect on the panet. But uvb doesn't make it through the ozone layer everywhere like you stated you nitwit
a mongo frog
Well-Known Member
Garden work or 9-5 type shit?
BOBBY_G
Well-Known Member
short answer after hours of rabbit-holing:
supercapacitors come in 2.5-2.7V and with a resistor can be tuned down to the 1.8-2.25V we need
following this methodology (keeping in mind our LEDs are much brighter and more power hungry than application)
http://electronics.stackexchange.com/questions/67980/how-long-would-a-150-farad-capacitor-light-up-an-led
lets say we start with a 500 farad 2.7v capacitor ($4), little more w/protection board) and put an LED and resistor in series
at full charge: 2.7V
desired led V(per) = 2.25V
resistor V = 2.7-2.25=450 mV
LED current = 1000 mA
resistor size = 450 mv/1000 mA = 0.45 (say 0.5 ohms)
capacitor time constant (time to drop to 36.8% of voltage) = 500F x 0.5ohms = 250 sec, just over 4 min
BUT the min voltage for the diode is 1.8V, so we wold get maybe a minute out of it
lets try it starting at 500 mA
at full charge: 2.7V
desired led V(per) = 2V
resistor V = 2.7-2=700 mV
LED current = 500 mA
resistor size = 700 mv/500 mA = 1.4 ohms
capacitor time constant (time to drop to 36.8% of voltage) = 500F x 1.4 ohms = 700 sec, just over 10 min
so wed get a few minutes out of it in this case
BOBBY_G
Well-Known Member
option #2: charge a li-po battery like they use in toy helicopters. these are known for having high 'C' discharge rates
lets say you put XP-E leds in a room
x strings of 7 in series, a string of 7 leds would operate between 16 and 12.5V and then fall off
this is right about the voltage of a 4cell ("14.8 V") lipo battery
1 string of 7 LEDs = 1000 mA = 1 AH to run it for an hour, or 100mah to run it for 6 minutes
they make batteries in 450 and 650 mah that could run 5-7 strings of these
during day- battery charges while lights are on. lights off>relay> battery clicks from charger over to LEDs> drains in 6 minutes relay kicks back to charging when lights come on
lets say you put XP-E leds in a room
x strings of 7 in series, a string of 7 leds would operate between 16 and 12.5V and then fall off
this is right about the voltage of a 4cell ("14.8 V") lipo battery
1 string of 7 LEDs = 1000 mA = 1 AH to run it for an hour, or 100mah to run it for 6 minutes
they make batteries in 450 and 650 mah that could run 5-7 strings of these
during day- battery charges while lights are on. lights off>relay> battery clicks from charger over to LEDs> drains in 6 minutes relay kicks back to charging when lights come on
BOBBY_G
Well-Known Member
moral of the story - i could have built an interval timer setup in the time it took me to research that...
BUT in the second case, the li-po battery and charger and relay is prob about the cost of the drivers you would need to run those so its like youre getting a (hack of a) solution for 'free'
BUT in the second case, the li-po battery and charger and relay is prob about the cost of the drivers you would need to run those so its like youre getting a (hack of a) solution for 'free'
welight
Well-Known Member
I know I can build it, question is does it really make sense, your paying for about 550mm of bare unused mcpcb?
Cheers
Mark