Hi all,
I have been using LED head light bulbs in my Ecosport for over a year now. As I started experimenting with a wide budget ranges starting from the cheapest on Amazon, to above 2.5K on AliExpress, I thought I'd put up some pics here so that prospective buyers could get an idea of what to expect and what to avoid.
Starring off, my car uses an H4 bulb, which is the most common in India, and also possibly the worst design. Because it uses the same bulb for high and low beams, the beam quality is often a compromise. With good reflector design and high brightness, the beam can be made quite good, but the spread is almost always uneven, especially with smaller, non-rounded reflectors. The best option would always be an upgrade to a properly done projector retrofit, but it's an expensive option.
The first upgrade I made was to switch to a relay setup with ceramic connectors and blue colored 100/90W bulbs from a local accessory shop. While the wiring kit from TVS was good, the bulbs were quite horrible, and other than the less yellowish color, there was nothing good about them. Stay away from these kind of blue bulbs!

The beam pattern was quite horrible, even worse than the original OSRAM 55/60W!

Within a week, I went back and upgraded to 130/90W OSRAM Rally bulbs. These are not meant for on road use and it says to on the packaging. But at the time, I just wanted brighter headlamps and 130W was better than 100W for only a little bit more. This is how the pattern looks like.

As you can see, the difference in lighting was like day and night. I only rarely use the high beam on my car, mostly to flash in corners, and to alert the occasional oncoming idiot who refuses to dip. For that purpose, the 130W high beam is awesome. It has excellent range, and the only downside is the incredible amount of heat generated. If you stand two feet in front of the headlights, you can feel the heat on your body!
After hearing about LED headlamps, I decided to buy a pair off Amazon. These were called C6 LED bulbs. This is what they look like. Avoid them like the plague, as they have a horrible beam pattern, and bad quality LED chips that have coloured edges, and loud, noisy fans.

The main problems are the heavy color fringeing, lower brightness than halogens, lack of focus spot for the high beam, and noisy operation. They are also very unreliable and you should only use them as bling. They are useless as headlamps. On the plus side, since they scatter so much light, others can see you very well, and won't crash into you, I guess!! Please stay away from them.
The next type of lamps are very common nowadays. These are 6000K CSP LED bulbs. I got these from AliExpress from a company called OSLAMP. They are very good, but tend to burn out if you keep the headlamp's dust cover on, as there is no cooling fan and only a heat sink. I have already uploaded pictures of these in previous posts. Build quality is very good. This would also be good for projector setups, as they mimic halogen filament placement closely.
Here's the beam pattern. These have a very good low beam and high beam pattern. But in some conditions, the white light gets scattered and the range is affected.

You can see that the beam pattern closely matches that of the halogens, and the brightness is much more. I've been using these for more than a year now. One bulb burnt out because of overheating, but I ordered another set immediately.
Finally, I have the new 4300K HLXG LEDs that I just got last week. These are supposed to be the best of both worlds, as you get the correct color for longer range and for rain/fog performance, as well as the increased brightness and instant startup of LEDs.

Note the more yellowish chips. The more reddish the chip color, the warmer the color temp. 3000K chips look orange.

This model comes with a nicely sculpted heatsink, and a separate driver for better heat dissipation.
This is the clamp for attaching the bulb to the standard H4 reflector holder. Note the asymmetrical guides to ensure the bulb is installed correctly.

This is what it looks like, fitted inside the reflector. Note that the bulb is angled to the driver side.

With the LED fog lamps on:

With only the fog lamps on:
Hope this has been useful!! Feel free to ask questions!