If it gets any sunlight it needs to be kept warm enough to grow and you will need to provide light on the back side of the plant while the window provides light up front. Pictures please. This is my Fukushu kumquat tree

Thanks for getting back to me Steve. Here’s a photo of my tree:

John Cardella, if you keep your tree in front of that window through the winter, you need to place the entire in the window. Raise the tree so that the container (roots) are also receiving sunshine to also be warm. Otherwise your tree has an excellent chance of WLD leaf drop.

Thanks for your advice. Here’s the final setup!

Looks lovely!

most of my citrus does not get supplemental lighting. I am careful about sun exposure, as Silica noted.

For those that do get the extra lighting, I focus on extending the daily photoperiod

kabrahamsen, you talked a lot about your setup, but did you mention the type/brand, wattage, # of lumens, etc. of lighting you use?

Hi Dave,

The exact same make/Model/Wattage that John stated, which is what prompted me to respond. I have about 1 years worth of experience with these Sansi bulbs and I thought my comments might be beneficial to him. For reference, the bulb John mentioned and that I've worked with are most likely the Sansi 36 watt product. The Sansi 'Grow Bulbs' only lists 10w, 15w (three different styles), 24w, and 36w bulbs in their product line https://www.sansiled.com/led-grow-light.html?p=1 . However, you will also find listings for 39 watt and 40 watt bulbs as well on Amazon / ebay / etc. but unless these are 'special' models produced by Sansi, I think the listings are inaccurate as these wattages are not listed as part of the official Sansi 'Grow bulb' product line. I think some of the model confusion comes from the fact that John mentions he's using a 40 watt bulb (and I originally misstated mine were 39 watts), but I only see 36 watts as the closest wattage to an actual Sansi product.

Many more detailed specifications for this bulb model can be seen at: https://www.sansiled.com/36w-led-grow-light-bulb-full-cycle.html

The Luminous Flux is stated as: 2680lm

PPFD is stated as: 193.88μmol/s/m²

I hope this helps.

Ken

Thanks for the great insight, Ken. Your plants look great. That's reassuring to hear your citrus are thriving with a similar bulb especially being indoors year-round. I just moved my light a little higher per your suggestion so I do not burn the leaves.

Here is the link to the bulb I purchased: https://www.amazon.ca/gp/product/B07DL84SNK/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

I am a little concerned though as this bulb is not specifically listed by Sansi as a grow bulb (as you suggested Ken) as it is not full spectrum. Do you know if this would have an impact on growth?

Thanks again!

Hi John,

I looked at all of Sansi's listed products at the https://www.sansiled.com/led-light-bulb.html link and there are no 39w or 40w bulb products listed, so I don't know what to say. Their Canadian store does also list the 34w product separately https://www.amazon.ca/SANSI-Daylight-Spectrum-Gardening-Residential/dp/B07H2XD6S2?ref_=ast_sto_dp, so the listing you referenced does seem to be a different product with different specifications.

Their 'Grow' bulbs list the beam width as 60 degrees. This significantly focuses the light (which probably is one reason why you'll risk burning leaves if it is too close) but also provides the trees with the possibility of higher intensity light with less light 'spill'/waste. The beam for your model is stated as 120 degrees, so the available light is more dispersed. I guess it depends on what you want / trying to do (light intensity versus the physical area the lights cover).

Even though this model may not have been made for plants, how have your trees been doing using this light?

There is the following question and answer from one of the buyers of your model (but states a different wattage):

"Question:

I bought the 35 watt for growing my plants, would this brighter light be better for that application?

Answer:

I asked Sansi about the feasibility of using this bulb for growing plants. They replied stating that because of the spectrum, and the lensing that this bulb was not ideal for growing. Sansi does have good lights for growing plants. I have the 24 and 36 watters and they work well for small plants or as supplementary lighting. Now the 40 watter in question would likely be okay as supplementary lighting, ideally added to a "red heavy" light environment. Because it has lots of power in the "blue-end", it ought to be suitable for "vegging". I bought this 40 watt photon monster for the novelty of having the brightest, passively cooled, e26-screw-in bulb in the world! see less
By peter on May 25, 2020"

Ken