Meanwell LDD driver: for those who want to dim to 0 using Arduino
- Thread starter pwreef
- Start date
mattclark82
New member
+1
If there are any available for sale, I would like to purchase one as well :>
If there are any available for sale, I would like to purchase one as well :>
Nope- they're only needed if you intend to PWM dim your lighting to acclimate corals, run your drivers at less than max, ect.. The LDD's will just default to full output without the pulldown resistors installed.
. No- the resistors are not needed for PWM dimming to be functional. The resistors merely change the behavior of the LDD if a PWM signal is "lost". Normally the LDD will default to outputting "full-power" without a PWM control signal present. With the pulldown resistors installed- The LDD's will default to "Off"instead of "Bake my Corals". LOL
According to the folks at Meanwell, you still need to provide a few volts worth of headroom, but the wattage rating of the power supply seems to be more important that it's actual current rating. Stay below the maximum wattage rating and the LDD's should work fine.
nemosworld
Active member
Here is how I look at it:
for every ldd 1000h you need 1Amp
if you are using cree led your max amount of leds in series will be 14 on the safe side. so you will need 48v to have headroom.
so lets say you have 4 ldd 1000h/hw etc, I would get a power supply with 48v and 5 amps, hardly anyone runs there leds at an amp unless they have a deep tank, most reefers with 24inch and below tanks run their lights around 700 -750ma some a little higher.
if you get ldd 700 series, then you still need at-least 1 amp for each one.
actually 4 ldd 700 series is only 2amps 800ma, so one could go with a 3 amp supply, though I would do 4 amps.
for every ldd 1000h you need 1Amp
if you are using cree led your max amount of leds in series will be 14 on the safe side. so you will need 48v to have headroom.
so lets say you have 4 ldd 1000h/hw etc, I would get a power supply with 48v and 5 amps, hardly anyone runs there leds at an amp unless they have a deep tank, most reefers with 24inch and below tanks run their lights around 700 -750ma some a little higher.
if you get ldd 700 series, then you still need at-least 1 amp for each one.
actually 4 ldd 700 series is only 2amps 800ma, so one could go with a 3 amp supply, though I would do 4 amps.
I thought you reduced the voltage not the amperage for the dimming.
nemosworld
Active member
yes, you are lowering the voltage when you dim, but you still need the proper amperage to power the ldd's.
you need to cover both basis when buying your power supply.
with a cree led which I believe runs at about 3.1v depending on the bin.
you would divide that by the voltage of the ldd, which has a max voltage of 52. that would put you at slightly over 16 leds, however your power supply having only 48v would put you at 14 leds.
hope this makes sense, if not; someone with more electrical experience will have to chime in.
joshlawless
New member
http://www.powergatellc.com/mean-well-se-1500-48-power-supply.html
1500W is as high as the Mean Well SE series goes. You can get more power still from the RSP series (2000, 2400, or even 3000 watts), but the price jumps up when you get into the RSP series.
1500W is all you're going to want to plug into a 15A household circuit (all by itself), anyways. For the price, you'd be better off with multiple 600W power supplies (SE-600-48). You can buy three (totaling 1800W) for less than the price of the single 1500W model.
+1 on the above advice. The old saying : "Don't put all your Eggs into one Basket" comes into play here.
Giga
New member
also how many of the luxeon m's with one 1000ldd run?
http://shop.stevesleds.com/Philips-Luxeon-M-ROYAL-BLUE-12-Watt-LEDs-Luxeon-M-RB.htm
http://shop.stevesleds.com/Philips-Luxeon-M-ROYAL-BLUE-12-Watt-LEDs-Luxeon-M-RB.htm
