Grow Diaries

FACE-OFF: 90W LED vs 125W CFL

​The Kale and Lettuce starts were end-of-season plants that were obviously struggling to stay alive at the garden centre as the weather turned against them - not the most ideal candidates for the experiment but since it was the end of the summer, alternative candidates were very limited.

​​As it turns out both plant types grew well under both the LED and CFL lighting that was used with both the Kale and the Lettuce doing slightly better under the LED light than the CFL light. However, the differences in growth were small and could have been due to other factors other than the lighting, so don't read too much into this result.

Day 0

Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 0 (i.e. when seedlings were repotted in larger pots)

Day ​6

Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 6

Day ​12

Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 12

Day ​15

Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 15

Day ​21

Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 21

Day​ 29

Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 29
Image showing Lettuce and Kale growth under LED versus CFL grow lighting on day 29 (picture taken from a lower angle)

*******End of Experiment *******


Grow Diary: 90W LED - Cucumber

​Cucumber plants started from seeds have grown very well under LED lighting with the first signs of cucumbers appearing (see Day 29 below) at approximately 6 weeks after seeds were planted. Different plants have grown at different rates so some of the spectacular growth of some of the plants have been due to genetic factors, however all plants started have grown well under the LED lighting, showing no signs of any problems.

Day 0

Image showing Cucumber plant growth under LED grow lighting on day 0 (i.e. when seedlings were repotted into larger pots)

Da​y 7

Image showing Cucumber plant growth under LED grow lighting on day 7

Day ​14

Image showing Cucumber plant growth under LED grow lighting on day 14

Day ​21

Image showing Cucumber plant growth under LED grow lighting on day 21

Day ​29

Image showing Cucumber plant growth under LED grow lighting on day 29

Day 44

Image showing Cucumber plant growth under LED grow lighting on day 44

​The cucumber seed that generated this plant was from a Middle Eastern source and we are told that the cucumbers themselves do not grow more than about 10cm before they should be picked. This first LED-grown cucumber was just the right size so it was time to taste!

Image showing one of the cucumbers grown under LED grow lighting

Delicious!​​​​​


Grow Diary: 90W LED - Luffa

​Although the Luffa plants initially grew well under LED lighting, they began to slow down and look decidedly less healthy after 3 weeks of growth. It is not clear why they failed to continue growing at this point, but it did not seem worth keeping them going from this point on and the experiment was terminated. Any number of factors could have been responsible for the failure to continue growing including too low an ambient temperature or even unsuitable soil conditions, so it may not have been due to any inadequacy of the LED lighting. Anyway, further experimentation will be carried out with the Luffa plants in the future, so stay tuned…

Day 0

Image showing Luffa plant growth under LED grow lighting on day 0 (i.e. when seedling was repotted into a larger pot)

Day ​7

Image showing Luffa plant growth under LED grow lighting on day 7

Day ​14

Image showing Luffa plant growth under LED grow lighting on day 14

Day ​21