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>It gets direct sun from like 3-6pm, so it has some natural light.

I notice it's developing a lemon rather nicely, so if you've had that plant in the location for half a year or more, then it seems pretty happy. However, if it's a new plant (or was newly moved to that location), additional supplemental lighting could be beneficial.


>I was looking at like 150-300 W bulbs because I had no clue. I was also looking at the blurple ones because I also had no clue

150W Bulbs are definitely overkill unless they're incandescent, and most of the energy from those bulbs radiates out as heat. I personally prefer full spectrum LEDs because I don't want the inside of my house to look like a nightclub (blurple is hard on the eyes) and LEDs are more energy efficient, outputting more light and less heat.

>Does the housing you put the bulb in matter? Do you just use one of those cheap metal ones from Home Depot?

Keep in mind that since you already have a red/blue spectrum grow lamp in that picture in addition to the window, so if you want more supplemental lighting, you probably don't need to go the full 36W that I linked earlier. The 24W version is probably sufficient. It's a pretty big bulb, so just make sure you find a housing that is big enough to fit it and is compatible both with its E26 Socket and its Wattage. I know some folks who use this sort of thing with it, and home depot probably offers something similar.

My trees are currently about 40 F and are doing well with kind of dim indirect light. At 70 F they would need many grow lights (about 12 for 4 trees) plus a sunny window. I've done it both ways and by far the easier winter maintenance is the 40 F room.

At any rate, this is the light I would buy:

https://www.amazon.com/LongStar-00453-FE-US-55W-Compact-Fluorescent/dp/B0041DK4D0/

Anything equivalent is fine, too. I put them into clamp lights and built a support for the lights from 4' x 8' boards that I would set up around the trees. I put them on a timer so the trees got 12 hours of light per day. Timers are very cheap and convenient. I never found an LED that I liked. Wattage is less important than lumens - go for as high a lumen value as you can find within your price range.

This is the one I use: https://www.amazon.com/TaoTronics-Spectrum-Hydroponics-Organic-Wavelengths/dp/B01HPIPM70/

also is great for starting my garden vegetable seedings indoors. I've had mine for 3 yrs now.

You'll need one of these reflector adaptors for it if you don't have something you can put the light bulb in: https://www.amazon.com/Simple-Deluxe-Aluminum-Reflector-Included/dp/B01E9IY6US/

but don't bother buying one of those online. The grow light is very large so they stick out oddly rendering the reflector-part useless, you only need it for the ability to house a weird shaped light bulb and clamp feature. Once the bulb arrives you should take it to a store that sells hardware to find one that works. They're quite cheap in person, like $5 at Walmart when I got mine.

Grow lights in general will be kinda pricy because what you are looking for is an efficient LED, something that doesn't get hot and burn your plants, and something with the right amount of light spectrum colors to provide consistent growth regulations as if the plant was outside in real sunlight. Some companies cut corners so even if you don't buy the one I got, look out for those specific features.

What area are you in? Do you ever fertilize this tree?

Edit: just saw from your other post that you are in SoCal. The good news is that it doesn’t look like psyllid or greening damage. It looks like a severe nutrient deficiency. Buy this and follow the instructions: https://www.amazon.com/Espoma-CT4-4-Pound-Citrus-tone-5-2-6/dp/B001H1LS8E

Here’s an 18 pound bag. You have a decent sized tree, you’ll want the big bag for several uses. https://www.amazon.com/dp/B00F2QOV70/ref=cm_sw_r_cp_api_i_8sDVDbKCRPWF2

That’s looks like carpenter bees for sure. Try one of these to trap them and release them somewhere away from your tree.

Original B Brothers-Carpenter Bee Trap https://www.amazon.com/dp/B07QBJ7NSB/ref=cm_sw_r_cp_api_i_uVYADbPX6C8N6

These are the grow lights, I don't think I can post another photo into a reddit post - but I may just not know how. These days the plants are entirely inside, in my garage, with no natural lights.

Sorry, 24w, here's Amazon link
SANSI 24W LED Plant Light Bulb Full Spectrum LED Grow Light Plant Lights for Indoor Plants, E26 Grow Light https://www.amazon.com/dp/B07BRKT56T/ref=cm_sw_r_cp_apa_i_dCvxDbJZ2G661

Monterey LG6150 Insect Spray, 16 Ounce https://www.amazon.com/dp/B000BWY3OQ/ref=cm_sw_r_cp_api_i_IA.CDb4SXZDJ1