The Rotolight NEO I is a nice little light, you can dial in WB 3200 to 6000K and can shoot several hours on a set of batteries. The light quality is not that hard even without a modifier, not as soft as if using a soft box but then not as hard as bare bulb (direct with softer shadow transition). However the problem is that it is also not very strong. Used the NEO I to supplement natural light on a model shoot in a small room of a B&B. Results were very nice but was shooting at about 1/250 f1.8 with iso 640 with the light at approx 3-4 ft away.
There is a new NEO II that is a little more powerful in constant light mode but still doesn't offer 1 stop more light (prob about 80% stronger than NEO I). One benefit of the NEO II is that it can also operate in flash mode up to 1/8000 with basically no recycle time. The flash output as described by the manufacturer is several stops brighter than the constant light output, and can be fired remotely by a Elinchrom trigger.
There are several other light made By Rotolight that are quite a bit more powerful but also carry a heavier price. Was waiting to see if they introduce a NEO III as would like to get something in that size (easily carried in camera backpack) but at least 2-3 stops more powerful in constant light mode.
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