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Ultra-Compact Lightweight 100-Watt Pin-Fin Heatsink
Large Mounting Area For COB/SMD arrays
Mingfa Tech today introduced a new model of the ActiLED-G5850 with a long life of 7,000 to 100,000 hours. It is not only suitable for SMD light source, but also suitable for COB LES 30mm or more.
Max Recommended Wattage 100 WATT (Note 1)
LED Compatibility SMD Arrays, COBS, AC-COBS and “Driverless” LED Arrays
Thermal Resistance (sink to ambient) 0.45 Degrees C /Watt
Type of Fan Computer-Grade, Dual-Ball-Bearing
Fan Speed 4000 RPM
Air flow 3 CFM
Fan Operating Voltage 8-14 VDC
Fan Operating current .02 Amp DC
Noise Level 19 db Max (Measured One Meter Away)
Fan Life Expectancy 75,000 Operating Hours @25C Ambient
Heat Sink Material High-Thermal-Conductivity 1070 Aluminum. Black Anodized
Overall Dimensions (including Fan) 58 mm Diameter, 50 mm Height
Weight 6 ounces
Mounting Base Thickness 5 mm
Mounting the unit The two screws holes on top of fan can be used to hang unit(such as in a growlight application or to mount to rigid luminaire housing, by slightly loosening screw and placing wires or mounting brackets under head of screw.)
Note 1: Max recommended wattage to ensure LED case temperature stays below 80 C
Meanwell 100-watt LED Driver 12V, 2-Watt, Fan-Power Module, Meanwell IRM-02-12
These two suggested standard, low-cost, UL-recognized modules are available from virtually any authorized Meanwell distributor. However, any modules with specifications can also be used.
Thermal considerations-- COBs can be mounted with thermal interface compound or a thermal-interface pad. It is very important to make making sure COB is attached, without any air gaps, as closely as possible to surface of heatsink to ensure proper heat transfer.
Figure 1 100-watt 38mm US/European MCB-style COB, shown here mounted with solder-less BJB 47-319 COB connector/holder. Holder can be purchased separately from many online sellers or any BJB distributor such as Mouser Electronics, Mouser part number 339-47319416050 .
Figure 2 100 watt “China-style” COB with integral lead-frame-- facilitating easy solderable wire connections (separate COB holder not needed).
Figure 3 Typical US/European style COB, simply with soldered wire connections, no holder used.
Figure 4 shows typical connections for 100-watt, light fixture for horticultural us.
Figure 5 shows how to operate the fan directly from the existing LED driver DC voltage instead of a separate power supply. All that is needed is a simple resistor, R-1.
The value of R1 is as follows. R1= V(L) – V(F) divided by I(F) where V(L) is the approximate maximum voltage of the LED driver, V(F) is the fan voltage and I(F) is the approximate fan current .
Example—Assume an LED driver with a 32-36 V output at full power. Also assume we have a low speed (4000 RPM or less) 12V fan operating at no more than 30mA. Doing the math will give a “dropping” resistor value of 1,000 ohms, to drop the 36V down to the desired 12V for the fan. The resistor will dissipate about 0.6W, so a simple 1K resistor, costing less than 10 cents, would be suggested, with a 2 watt rating, so the resistor does not get too hot. The tiny amount of power diverted from the LED driver would have no perceived effect on LED brightness.