LED tubes have really taken off. Probably because of the quality diodes used huh? I get what you are talking about DIY now - did you make that cube yourself?
This is a year old thread. A lot of changes in led tech have hit the market since then.
The tubes I used for that grow are common 4ft tubes, but 3000K
The Cube came from Discovery Toys, it's a child tent frame
Check out my new thread. I will be adding 2 x 3ft custom spectrum light rails from BML Horticulture