Ok, I will try to clear up some things here.
First HH is not just any hallucination, if it was then it would not have a special name. HH happens when you are on the threshold to sleep. colours and flashes of light are just a sign that you have your eyes closed long enough that the light reception nerves in you eyes start producing random signals. HH is when the brain starts adding information to make complete pictures. This is the beginning of the transition phase to sleep, when the brain make up everything. Up to this point they are just random signals. It is the same with tinnitus. Lots of people have tinnitus while they are awake. It does not have anything to do with HH. HH is sound that makes sense, like words. Flashing lights and loud tinnitus tend to come just before HH, but that is because you are very relaxed. In a relaxed state, with your eyes closed and in a quiet room, you become more aware of these things. It is a sign that you are getting relaxed enough for WILD, but it is not HH.
As for WILD and WBTB. It is defiantly easier to do WILD with WBTB or with naps. Some people can have dreams in non-REM sleep, but they tend to be less vivid, and fuzzy. Remembering dreams that happen early in the night is also more difficult. Dreams that come later in the night tend to erase the memories of earlier dreams. That means that if you do WILD when you go to bed you should try to wake up right after the dream so that you can remember it. ( most people who start out with WILD at night say that they can’t wake up during the night and that is why they do not want to do WBTB. ) You will probably have fuzzy LD’s if you remember them, and you will be doing a lot of work for this without even knowing if you can WILD.
Because of all of that, for beginners that have not had a LD yet, I will continue to say that they should not start with WILD when they go to bed. That is kind of like saying “I have heard that mountain climbing is lots of fun, I am going to try to climb Mt. Everest.” Even if a person can do WILD at bedtime without WBTB, they should probably not start with that. There is someone who is right now posting that he has been trying WILD for 7-8 months without success. There are easier ways for beginners to learn LD’ing. I think that it makes more sense to suggest that they try something that gives easier faster results. After they know that they can LD, then they can work on the more difficult techs. and see if they work for them.
I also admit that there are people who can do WILD within the first week of trying, but there are not very many of them.