MR16 1*3W 650~700mA Constant Current Regulated LED Driver (8~40V Input)

Pros: This is a great driver that drives leds with a constant current of +/-680mA. Although it says it can power only one led in serie, it can also power two and the current is the same, also the heat dissipation.
I tried also three leds but with input voltage of 12.04 the curren't to the leds was only 540mA.. That may be higher if the input voltage was higher also (this is a guess, haven't tried).

Cons: Unfortunately it can not power three leds at 12V. Hey, but still, better than title says :-)

Other: Still, it is better than description, so buy some of these!

Pros: Works on 12 VAC as well as 12VDC (so you can't connect it wrongly)
Fits into 12V lights that accept halogen bulbs.
Works (thats the important bit)

Cons: Legs a little on the thick side (needed some persuasion to fit in my lamp)

Other: I used a Cree P4 with this to convert a desk lamp to LED. At this current the LED will need a good heat sink. I cut a disk of aluminium the same size as my lamps glass lens and mounted the LED on that, which fit nicely on to the lamp.
Will be buying more.

Pros: -It delivers very reliable current, ~620ma by my measurement. -It can easily power 2 leds in series off of a 12v battery. This is an excellent feature. -Easy to set up -Driver stays cool

Cons: It has a bridge rectifying diode set up so that it can accept ac or dc. Not a real con, but you can bypass the diodes if you check the polarity and save a little efficiency when running off of DC.

Other: This is a very useful product. Perfect for what I needed it for. If you want to power 1 to 2 3w LEDs off of 12v, this is the driver you want.

Pros: Efficiency is fantastic! I measured 94% efficiency with 12VDC and 3 LED's, bypassing the bridge rectifier. As a consequence, it also stays very cool.
So easy to mod. I added a 1 ohm resistor to increase current to 770mA and also bypassed the bridge rectifier to improve efficiency a little. You can even piggy back a PWM circuit if you want, for external control and custom modes.
It's small, and you can even cut it smaller if you don't need the bridge rectifier.

Cons: There is no output capacitor. This may cause interference with nearby electronics. Add a 1uF capacitor across the output to reduce RF interference.
It's only ~80% efficient with one LED.
Input capacitor is only rated for 25V. DX claims 8 to 40V input. You will need to upgrade the capacitor for >25V.

Other: I'm using this with sku.15084 for a 3 LED bike light and it works great!

Pros: The module is based on the PowTech PT4115 step-down LED driver, with 5000:1 Dimming via PWM if needed.
Input voltage is really 8-30V.
Current is set by the only resistor on the module. I put in a 1ohm, which gives 100mA instead of 650mA. So it can drive 1W or 1/2W LEDs too....
Up to 1.2A current drive is possible.

Cons: None that I can think of

Other: Very versatile small LED driver for up to 30V input.

Pros: Small and a practical drive, easy to use, easy connection. Changing the resistance can easily change the output current and power other than 3W LEDs

Cons: Drive the input rectifier so if you want to achieve more effective input to connect across a diode or unsoldering. As input could be stranded. Now the iron bars as input, and they take off down badly.

Other: I will buy more if needed

Pros: I use this driver to light up two 3w warm white LEDs purchsed elsewhere.
I connected two 3w LEDs in series into a desktop lamp(12v output) and whala! it works straight away and it is very very bright! This is the first brightest ones i have ever seen! The desktop lamp is so bright and you would not think it is LED!!

Cons: The driver is getting a bit hot and I will use heatsink to cool it down although i hv not done so but i know what i am doing and i am quite happy about it.

Other: it is a good driver for such a price!

Pros: - PowTech PT4115: extremely easy to mod for your own purpose: change the sense resistor to vary your average current, you can also add a potentiometer or PWN module to dim your LED :-O - Can handle AC and DC, I didnt remove the bridge rectifier for the case I have to use AC. Although the efficiency will suffer, its the better solution for me. - Wiiiiiide input range. I wont go over 24VDC because of the small input capacitor, but anyway, there ist no better driver to build your 12V/24V LED project. Notice the input voltage must be higher than the summarized LED Vf.

Cons: - RF interferences. But you can solve this easily: Just solder a capacitor to the board at the output pins (where Led+ and LED- is). I chose a small 16V 220µF and it is already sufficient at 12VDC input. I can listen to FM radio next to the driver. - Small input capacotor, mine has only 100µF/25V. Not relevant for DC, but will not be able to supply multiple LEDs in series at AC. Replacing it with a new one is easy. For calculations see threads below.

Other: I removed the long MR16 pins to get it smaller. Get a small solder iron for the small parts (e.g. if you want to solder a pot to the chip). For me the most perfect driver I ever got.

Pros: this thing is great i use it on my honda xr400 for the head light. i have 2 running on just the stator power and it does exactly what i want. the stater puts anywhere from about 9-15volts ac so i left the bridge in because i dont have any reason for rf signals.

Cons: some cons of this product are that it gets hot but as long as you take and put it on a very small heat sink you should have no problems also i would not put it up to 40 volts ac or dc it get super hot and starts to fail and melt. but maybe thats just the ones i got. another thing that would have been nice is a little wiring diagram or something to tell me what was what because once i got it i had to come back online and look for it.

Other: great product and i will be buying more in the future

Pros: It works very well in a wide range of voltage.
Can be dimmed with some small modification.

Cons: Dim-Pin is not made available on the PCB, but its not that difficult to add a wire for dimming.

Other: The self-mounted dim only accepts 5V-input! Don't kill your device! The regulator is very small, so you need some practice to add a thin wire for the dimming.