Hi - I am new to this site and have been reading for a few days now looking for any information that I can find in an attempt to diagnose what is going on with my lemon tree. Here is where I stand with her today:
1- She's indoor only (I live in a condo without a yard; I do have a balcony but it does not get sun - even indirectly). 2- I have a 150-watt Dayspot grow light on her for at least 10 hours a day. 3- About a year ago, she starting losing a lot of leaves and I took some to my local botanical garden. They said I needed to increase the acid and iron content in her water so every time I water (which is about once a week), I add Green Light Iron & Soil Acidifier to the water, and I let in run through completely. 4- I sprinkle on the top of the soil NutriStar Citrus & Avocado food for fertilizer.
She does produce fruit usually 2-3 lemons a year and they can take up to 8 months to turn yellow. I am very diligent about scale and check her almost daily. Recently, she has started to lose more leaves (a lot). I understand that leaves die off but it seems as though this is more than her usual. Besides that, she just doesn't appear healthy to me.

From the reading I have been doing on this forum, I have put together a list of things that I'm going to try first, for example: re-potting her in CHC (I ordered it online and it hasn't arrived yet), fertilizing with Jack's 25-5-15 (again, waiting for UPS) and I have ordered a T5 8 tube lighting system to mount on my ceiling.

Am I on the right track with this? I noticed that the leaves that she is losing do not have the petiole on it – which means she is stressed. The thing is - none of her conditions have changed recently.

Any other suggestions that you can think of would be much appreciated.

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One more pic!! I just love her so much!

seems like you are on the right track.

How long has it been since you repotted?

Looking at the photos submitted, I don't see much of anything wrong with your tree. It seems healthy enough. At this time of year container citrus trees frequently drop a higher level of leaves than usual, which can easily just be old leaves that have lived out their usefulness. You wrote........"so every time I water (which is about once a week), I add Green Light Iron & Soil Acidified to the water, and I let in run through completely........ When a tree develops a deficiency it is proper to apply the need nutrient to correct the problem, but when the situation is corrected, the application of the nutrient should be discontinued. Adding iron to your tree every week, can raise the iron to a toxic level. - Millet (980-)