Don't attempt it unless you are at least light level 305. Yeah it's possible to do if your are lower but it's just makes it easier to find a team and it's not worth the trouble, if your below 305 just do normal and work toward getting to 305. If you are under 311 only go up to oryx. Yeah you can prob luck out and get a team to carry you though oryx but again it's just not worth the trouble. I beat oryx last night on my 311 Titan and didn't even die besides when the whole team got killed by oryx, it's a world of difference. Rage on if you want about light levels I'm just giving advice on how you can do the raid without the stress and the multitude of hours.
Just a tip