Hey pal,
They are just 30w 5500k spectrum LED corn bulbs, added them as side lighting in my Sour Crack grow, used them as a alternative to CFL bulbs as they put out less heat and put out more lumens (4500 roughly each) than a 30W CFL bulb.
Not to sure what part they have to play of any in the height of the plants, they are run from about Week two onwards all through the grow, bud quality on the lowers and the side branching has improved for sure since adding them though.