Hi, I am new to forum and know very little on electricals and electronics. Now i have a few OSRAM Ostar 12V LEDs (https://goo.gl/04rrZy) with heatsink which i am working with as a hobby. Power source is a car battery. Here i list all my query one by one 1. As per the datasheet of this LED, it say the working forward current is between 50 ~ 1500 mA. But when i connect this LED directly to Power Source without any resistance in circuit, it draws only 490 mA of current. But how to make it to draw around 1 A of current so that i could get a better brightness? Note: after going through a few articles i came to know a constant current circuit is available which supplies a constant current irrespective of voltage variation. In that case can i make a circuit with a output of 1A and supply to this LED so that it is forced with a 1A current in it? 2. Another trial requires me to connect two of these 12V LED in series. But my source is just a 12V (13.5v to be precise) car battery. Is it possible to make any circuit so that i can power up this series connection. Here also i needed the LEDs to draw a 1A of current. 3. In another case i have a 6V LED (https://goo.gl/h3YLxP). So what kind of a circuit should i make for it to be powered up by the same 12 v battery and make the led to draw around 500mA of current. I hope the post is easy to understand. Sorry for my english as terms used as i am not an expert in electricals.