The necrotic leaves look like victims to spidermite damage. Get a handheld microscope and examine them. They aren't terribly expensive. If you have a magnifying glass, might be able to make them out with it. You'll need to use a pesticide if that is the problem. It appears you have a pretty good size population of mites and they breed REALLY fast. Webbing does not always occur on the leaves unless you just completely leave them be, so don't assume a lack of webbing means a lack of mites. I have used insecticidal soaps to control mites successfully in the past. Neem is claimed to work, but it has too many drawbacks for my liking. Plus, it's a very potent poison to aquatic life, so I don't feel comfortable putting it in our waterways even indirectly. Anyway, you have to get both these types of products on the mites or completely coat the leaves so the mites can't eat anywhere. Mites tend to congregate on the undersides of leaves, but they don't stay there. You will have to coat the tops and bottoms of leaves. Your first course of action should be to remove all affected leaves very carefully while the fan is off so that you can remove the highest concentrations from the room altogether.

You may have a fungus on your pepper plants, but those dark spots which seem more concentrated on the veins can also be a result of overfeeding a bit. Back off the nitrogen a bit on the peppers. I never use grow solution on peppers anymore and consequently I never have problems with oversized leaves that invite insects or blossom drop.

In the picture where the pepper plant appears to be yellow, is that because of lighting or because the plant is actually yellow? If it's yellow, you might be battling root rot in that one. Pull it out and smell the root ball.

wouldn't fungal gnats have the same type of looking damage as spider mites do because i have see some of them so i got stick cards to monitor them and there is an infestation of fungal gnats.. as for the spider mites the neem oil that i am spraying should take care of them & yes i am spraying the whole plant undersides of leaves and every thing very generously with the neem oil/dawn dish soap mix that i spray every week.
for the neem oil why is it not good to use on a hydro setup?
The pictures that are looking orange/yellow are from the bad cam and high pressure sodium light i was taking the pictures under .when i smell my root what should the smell be like?

Fungus gnats are one good reason to avoid an active organic medium. It's common to get gnats from bagged soil products. The larva are the problem, though. Not the adults. So, unless I'm wrong, your hydroton medium should not be infested. The damage doesn't look the same. Actually, gnat larva damage looks more like root rot damage in regard to your top growth. The plant will wilt and yellow due to a lack of ability to take up water and nutrients through the damaged root system. You obviously have fungus in your miracle gro medium. That will invite fungus gnats. But fungus gnats are named that for a reason. They will eat the fungus. Just because you have gnats doesn't mean that they are damaging your plants yet. It certainly doesn't mean the present damage is a result of gnat infestation. Do you want to prevent them from causing future problems? Absolutely. Will it fix your current one? I doubt it. Your plants don't appear to be suffering from a root problem.

Why not neem? I didn't say it's bad for hydro. It just has too many drawbacks in my opinion. Oils don't wash off so easily and thus inhibit transpiration. Transpiration is very important. You're inhibiting the plants ability to exhale or absorb CO2 if you are coating the leaves periodically. Soaps wash off and also break down. So I don't feel as bad about putting those in our waterways. I have read that adding a surfactant to the neem oil helps with being able to wash it off leaves.

Smell of root rot? I don't think the root rot actually produces the worst smell, but the opportunistic bacteria that grows as a result will. It smells like a sewer to me. The roots will be brown and look unhealthy. Brown doesn't mean anything alone, though. I wouldn't be concerned, though. I only suggested that because the plant appeared to be yellow throughout. Since that was due to technology, I doubt root rot is an issue at this time.

I AM GROWING INDOORS UNDER FLORESCENT LAMPS AND THE PLANTS LOOK GREAT, THEY FLOWER BUT PRODUCE NO FRUIT....THIS FOR BOTH PEPPERS AND TOMATOES

HOW CAN I GET FRUIT FROM THE FLOWERS....I POLLINATE MANUALLY ON EACH FLOWER