Unfortunately, for me, a mistake

I had bought the lamp as a replacement light in the morning and evening hours for chickweed, which I need for my budgies. The morning should run via timer 6-9 clock and evening 17-20 clock. Also ran, but, until their "natural death", not for two months!
As a comparative way I had let chickweed, grow in comparable lighting conditions, even without the lamp. By using this lamp I could find no better results.
Perhaps it is good indeed with other plant species and possibly I had with the short life so unlucky. Anyway, for me and my purposes, useless.