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As green Anaheim chiles turn red, the flavor moves from grassy earthy notes to a sweeter more complex flavor. Red Anaheim chiles deliver a medium sweet heat, a flavor which is enhanced by roasting.

This article may help you pinpoint the issue.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Most likely a Harbanero.

https://www.gardeningknowhow.com/edible/vegetables/pepper/growing-habanero-peppers.htm

These require lots and lots of light to produce correctly. Like tomatoes, they like to have temperatures that remain constant between day and night. After these requirements are met, flowers will become prolific. When this happens, it is as simple as lightly tapping the flowers, or shaking the branch. On many occasions, these will pollinate themselves without and outside help. If they are still not bearing fruit, there could be another issue.

The fruit will suffer from dehydration before the leaves do. Wilting leaves = severe dehydration of the plant. Don't wait for that sign before watering. Dig down an inch into the soil and if it is dry, it is time to water. Also, if nighttime temps are dropping into the 40s, chilies will have trouble. They like it hot!

There are a few things to note here. These lights are more suited to leafy greens that do not require much... With peppers, you will want 50 to 100 watts of light per plant in order for them to produce. I see some stretching in several of the plants.

I run LED myself, but I keep a general rule of about 750 watts to a 5x5 foot area. You might even think about using household LED, if you do not wish to purchase a horticultural grade LED. These can supply a good amount of light, although not as efficiently.

This could also be a nutrient issue, or a pH issue. Do you have a way to manage, and measure these?

And last, it could have something to do with your nutrient line that you are using... What would this be?

I'll be glad to help you further with more information.