New Grower First auto grow - question on led

[Bexter]

Thanks Hermitian. I'll get another 135w led ufo in the next couple of months, so will have a total of 270w and will hang 'em 1/4 metre from plants. Have to invest in carbon filter kit first - getting that tomorrow.

Have been thinking about using 2 x 15w led spot grow bulbs just as supplementary lighting - anyone had any experience?