@nysbadmk8
The lumens for the lamp are listed as 900-950 under Product Description.
It is difficult to compare leds to other lights; the leds in these lamps produce only red and blue wavelengths of light - those that plants use best. The lumens should just be measuring that light. The light produced by typical fluorescent tubes is a mixture of many different wavelengths of light only some of which are in the red and blue. As well, the leds have a much higher efficiency at turning electricity into light than other types of bulbs so a T5 that uses 54 watts to produce 5000 lumen of white light cannot be easily compared to a led that produces 900 lumens of just red and blue light and uses 4.5 watts.
The T5 more or less produces 90 lumens of 'white' light per watt consumed. These leds more or less produce 200 lumens of red+blue light per watt consumed.
The catch lies in the high cost of led lamps and their directionality.
It would be interesting to see how well the plants grow under the led lights but unfortunately we do not have a control group of plants growing under fluorescents (or any other type of bulb) to compare.
