CactiGuide.com

Many newer cameras (bridge, Micro 4/3, APSc, Full Frame) have the capability to record time lapse. I found that my 4 year old Panasonic bridge FZ-300 has this capability. This comes really useful to record night blooming cacti. https://www.flickr.com/photos/pjpfeiffe ... 833355238/
Some tips from experience:

• set focus using a flash light
  take a couple test shots immediately prior to starting time lapse
  shoot in manual
  use a flash diffuser if using pop-up flash
  set white balance to flash
  start with a fully charged battery
  use a tripod and turn camera image stabilization off
  for flower openings 1 to 2 minute intervals between captures
  greater number captures produce smother action
  use jpg only - there will be way too many pics to develop from raw
  camera might shut off between captures - probably will resume with all settings

Yes flash solves the lighting problems as if just using available light you can see the light varying between frames if the sky clouds over or the sun comes out.