Have you looked at the luxeon 3535L HE seems like it's comparable to the Samsung
The big advantage to the 3535L series it has blue and red also and smaller case size 3.5 x 3.5 vs. 5.6 x 3.0
I compared the LM561C, LM301A, and 3535L HE plus at 100 and 200 mA
The 3535 uses Lumiled's HE (high efficiency) Red Phosphor (see Luxeon White Paper #32, attached).
Add some 3535L Royal Blues and Reds then you can switch the reds and blues of and on or even easily adjust the current.
Strips are the perfect place to use a CCR constant current regulator. You can use a constant voltage supply with high wattage that will power all the strips.
A CCR is analogous to a dynamic current limiting resistor. The adjustable CCR is a simple economical and robust device designed to provide a cost effective solution for regulating current in LEDs.
The On-Semi CCR "Adjustable Constant Current Regulator & LED Driver" NSI45090JDT4G is adjustable from 90 mA to 160 mA which is the most efficient range for these mid power LEDs. The also have a 150mA to 350mA for higher powered LEDs. They can be connected in parallel for higher currents.
These guys are adjustable by resistance. A Fixed resistor or potentiometer.
The I/O connectors are in the PCB layout footprint.
For the 3535L's I would do a 16" strip with 16 white, 16 blue, and 21 red. I would use one 90ma to 160mA CCR for each string.
The blue and red are optional. It cost nothing extra to add the red and blue footprints to the PCB. Why 21 Red and 16 blue?
For a 2' x 4" canopy I'd connect 3 16" strips end to end to make a 48" bar. Then use 4 or 5 bars. Not sure until I measure the PPFD. A 2 strip length (32") would work in a $135.00 Gorilla Grow Tent LTGGT22 Tent, 2' x 2.5' x 5'7" across the 30" width, but it would push the sides out a little. Or 1 strip length across the 24" depth.
For 5 bars that would be 240 white ($86.00) and optionally blue ($122.00) and 340 red ($175.00) to cover a 4' x 4' canopy. Prices are DigiKey or Mouser.
I have a research test board that is going through the final steps before being fabricated.
It has various LED circuits on it including the CCRs.
I do have some strips with 16 White Luxeon Rebel ES using the 150-350mA CCR. The forward voltage for a strip is about 43V. The CCR's forward voltage is about 1.8V so the ideal power supply input will be about 44.8V. I always stay under 50V for electrical safety code. This PCB also has a very efficient switching CCR for 500mA to 1.5 Amp. It has some $0.20 PWM circuits (3 x $0.60) that stores the duty cycle and is programed via a single wire which is daisy chained. They can drive the dimmer pin on the switching CCR or they can drive drive 2 LEDs and the current is selected by resistance but only up to 50mA. This PWM chip is similar to the WS2811 NeoPixel LED Driver. My intervention is to support many strip dimmers with one µController and daisy-chaining all the PWM circuits with a single wire. This would be for the high powered 700ma to 2 Amp LEDs. There are also 16 LEDs that can accommodate either Cree XLamp LEDs (E.G. XP-3G) or OSRAM Olsen SSL. There is an ar3ea where some HDD-H Mean Well drivers acna be mounted and cut off the board to make a clean way to mount and LDD-H on a strip. And also some little boards for connecfting power to CoBs with a Molex Lite Trap connector, either a single or double.
Why 21 Red and 16 blue? So the strings forward voltages match. When I tested the CCR with red being driven with the same power supply the 10V difference made the red CCRs get hot. Hot is a sign of inefficiency. The do run more efficiently the cooler they are. driving the 16 white they get a little warm at 350 mA. So I added some screw holes to add a heatsink. There is a 100% copper thermal path from the thermal pad to the heatsink hole.
There is also a linear and a switcher 48V to 5V regulator circuits to provide power to the PWM circuits that are driving 27 Cree CLM R,G, and B LEDs. Like a NeoPixel board to use to write the µController code. The µController is an Atmel Attiny 817, with an DAC pin to drive the current adjust pin of the high current CCR.
And last but not least is a current balancer circuit for stings of LEDs or CoBs. The test circuit has 8 outputs up to 2 amps each. That can be powered with one HLG xxx-48. This is used rather than running CoBs or strings of LEDs in parallel. Parts cost is less than $10. They can be cascaded to support any number of outputs.
If the test of the 3535 L HE Plus works out well maybe I will have some fabricated. Or if anyone is feeling entrepreneurship like, I can give you the PCB Gerber files to make your own for resale. I'm not in this for the money.
I have some Gerber files for making 12" strip PCBs for 16 Luxeon Rebel and or 16 Xlamp XP. The XLamp footprint will also work with OSRAM Olsen SSL.
