Since I do with the conversion to LED lamps at the moment my experience, I bought the instrument to see what there actually arrives at light output. The lumen specifications are always dependent on the angle of the bulbs, now I have to test an inexpensive instrument to exactly. It's amazing what's coming out in comparing two. I would love to still be able to measure color temperature and CRI, but unfortunately it is very different equipment needed. Clear price / performance tip.