As a relative newcomer compared to alot of others, here's my experience on using/buying led fixtures.
It helps to work backwards-with the footprint of your tent space you will need at least 600 actual watts of power consumption to effectively illuminate that space. The advantage of using the best technology you can afford is that less of that 600W is converted to heat and more into usable photons that the plant can use to grow. Currently, the most economical is Samsung LM561c. It is available on light strips and Quantum Boards so a DIY fixture will be the best bang for the buck. If you are not comfortable building your own rig, at least do a little research on the different technologies-it will help to prevent throwing away an investment on equipment that isn't suited to what you want to achieve.