MR16 1*1W 320~350mA Constant Current Regulated LED Driver (8~30V Input)

Pros: Small and lightweight, looks like GU10 compatible. Polarity independent - it has a bridge rectifier so you can use even AC source (adapter or transformer). Good to drive 3-4 LEDs in series either in the car or some discrete spotlights in the living room.

Cons: Short and thin wires, both tore apart from the soldering pads while I was testing some reflectors and diffusers.

Other: Buy it, deserves the price when you have in mind that 1 piece could drive up to 4 LEDs (in series) if you have 16 V power source.

Pros: The new batch seems to be of much better quality - the wires are soldered much better and look a bit thicker with soft insulation.

Cons: Short wires, about 4.5 cm

Other: As I said before - buy as much as you need of these, they are pretty useful. I will buy more whenever I need them, noone can beat this price.
Line added for 500 chars compliance.
Line added for 500 chars compliance.
Line added for 500 chars compliance.

Pros: This unit is perfect for automotive application if you can tweak a little bit. It has rectifier which makes the unit usable for AC. And in addition it also makes it non-polarized for input. That is... you don't have to find out which is positive and which is negative for the input. (you still need to consider that for output, though). The problem is that it generates huge amount of radio interferrence, so that the FM radio is no longer audible. What you have to do is to remove the diode bridge rectifier and connect + to + and - to -. In my unit the rectifier had "MBS6" label on top and + and - indicator. I simply cut the legs and soldered small piece of metal legs from spare resistors. Then the radio interference disappeared completely. You now have to make sure the polarity of input, though. It is running perfectly and driving two red CREE LED in serial without any problem.

Cons: None unless you mind soldering.

Other: Great price and great product.

Pros: I bought this driver for #13288 1W emitter for a costume. It works well, providing electric energy needed for my emitter to illuminate greatly. I wired the positive/negative incorrectly, but only realize afterwards, but it’s OK because it has a rectlefier (which means you can also use this AC/DC) It doesn’t get hot or anything, which was pleasant. I wired it so I had long leeds to my emitter, and kept the driver in my navel.

Cons: The size is a bit tricky to accommodate in projects. The cap on the back is awkward. Soldering required, but you knew that. Short wires

Other: Great price for a very polite product.

Pros: Very cheap, do what it should, and easy to modify for your needs.

Cons: Could have been better documented. Does not come in any form of antistatic packaging. Short leads, but you probably want to solder directyly to the board anyway.

Other: This product is cheaper to buy just an inductor to build the device yourself.. at least here in Sweden. Very easy to modify for your needs, if you download the datasheet for PT4511 it's more or less built the same way as their typical application, so very easy to convert to 3W-version or make a dimmable version.

Pros: - Great price (especially the bulk rate) - High quality current output: I've used over a dozen of these drivers and they all provide a very constant current, and thus flicker-less LED lighting - Can be dimmed. The integrated circuit for this LED driver is the PT4115 LED controller, which contains a "DIM" input. Applying a pulse-width modified digital signal, or a variable DC voltage to this DIM input provides continuously-variable dimming of the LED. For more information on how to do this, see the PT4115 datasheet (it is very easy to read, so even a beginner DIYer should be able to do it). - Open-circuit protection: this driver will not be destroyed if it is not connected to a load when powered (this can happen to some LED drivers) - Thermal protection: the circuit will protect itself if it gets too hot - Highly efficient: the PT4115 is up to 97% efficient, so very little power is wasted - With a few modifications, it can output up to 1.2A at up to 30V, for a total power output of over 30W (this can be done by simply changing the resistor and inductor on the circuit. See the PT4115 datasheet for info on how to do this). This means that this driver can power LEDs up to 30W, although the inductor required for such high outputs would be a bit big for the circuit board. - Can be powered by either AC or DC voltage (but note that its maximum input voltage is NOT 40V, as stated in the product title. See my con section below for more info).

Cons: - The maximum input voltage is NOT 40V, as is stated in the product title. The PT4115 IC can only handle a maximum of 30V, and the onboard capacitor is only rated for 25V, so the actual maximum voltage that you can apply to this LED driver is 25V DC (or 30V DC if you upgrade the capacitor to one with a maximum rated voltage above 30V). If you are powering it by an AC source then it will be even lower: the maximum AC input voltage is 18V, according to the PT4115 datasheet. This is because once an AC voltage is rectified and smoothed, its DC voltage will be higher than the AC voltage.

Other: Excellent price and highly modifiable. Highly recommended for all 1W LEDs. Also has the excellent benefit of being dimmable with slight modifications.

Pros: - Great price (especially the bulk rate)
- High quality current output: I've used over a dozen of these drivers and they all provide a very constant current, and thus flicker-less LED lighting
- Can be dimmed. The integrated circuit for this LED driver is the PT4115 LED controller, which contains a "DIM" input. Applying a pulse-width modified digital signal, or a variable DC voltage to this DIM input provides continuously-variable dimming of the LED. For more information on how to do this, see the PT4115 datasheet (it is very easy to read, so even a beginner DIYer should be able to do it).
- Open-circuit protection: this driver will not be destroyed if it is not connected to a load when powered (this can happen to some LED drivers)
- Thermal protection: the circuit will protect itself if it gets too hot
- Highly efficient: the PT4115 is up to 97% efficient, so very little power is wasted
- With a few modifications, it can output up to 1.2A at up to 30V, for a total power output of over 30W (this can be done by simply changing the resistor and inductor on the circuit. See the PT4115 datasheet for info on how to do this). This means that this driver can power LEDs up to 30W, although the inductor required for such high outputs would be a bit big for the circuit board.
- Can be powered by either AC or DC voltage (but note that its maximum input voltage is NOT 40V, as stated in the product title. See my con section below for more info).

Cons: - The maximum input voltage is NOT 40V, as is stated in the product title. The PT4115 IC can only handle a maximum of 30V, and the onboard capacitor is only rated for 25V, so the actual maximum voltage that you can apply to this LED driver is 25V DC (or 30V DC if you upgrade the capacitor to one with a maximum rated voltage above 30V). If you are powering it by an AC source then it will be even lower: the maximum AC input voltage is 18V, according to the PT4115 datasheet. This is because once an AC voltage is rectified and smoothed, its DC voltage will be higher than the AC voltage.

Other: Excellent price and highly modifiable. Highly recommended for all 1W LEDs. Also has the excellent benefit of being dimmable with slight modifications.

Pros: many reviews that I read said that this LED driver is very easy to modify to add more features.
For few months I was just using it to drive 1x 1 watt LED.
But then I tried to experiment if it can support more LED in series if the input voltage is increased.
To my surprise, it can light 9 LED successfully when I provided 32 V DC input. The current remained at 360mA through out the test with LED amount connected in series = 2 to 9.
Thanks to the warning from other reviewer, I noticed that the capacitor used is only rated at 25 V (output capacitor), so I ran the unit for just 10 seconds to avoid unnecessary trouble when I drove 8-9 LED (26V- 29.5V).

Cons: none that I can think of or observe.
Be careful of the 25V rating of the capacitor, it may blow up the cap if you put voltage above 25 V for long period of time

Other: very good in terms of price, performance and possible modification.
no regrets in buying them

Pros: Great for driving 1watt LEDs in series. Can drive up to 4-5 Red LEDs in an automobile application (or 3-4 White LEDs)

Cons: None really. Needed to remove the "MR16" posts, but no biggie. May provide FM radio interference, but see workaround below.

Other: Perfect for driving 1watt LEDs

Pros: Really easy to remove and jumper the AC bridge diodes and solder to the dim pin.

Cons: Only 2 out of 3 worked as they should have. One of them just pushed all the current on the input side to the output side. Fortunately I was using a current-limited supply and didn't fry my LEDs.

Other: Small, easy to mod, works like a charm. Hate to bang them on quality but 1 dud out of 3 isn't a great ratio.