No, it’s not necessary. We have many installations in city centres, where there’s ambient light. Of course, more ambient light means lower relative brightness of the projection. The main factor describing the quality of the projection is the illuminance, (ANSI Lumens per square metre) measured in Lux. Our projector outputs 6000 ANSI Lumens. The form for calculation is as follows: Lumens / Square Metres = Lux. If you use it to illuminate 100 square metres, that would give 6000 / 100 = 60 Lux illuminance. If you use it to illuminate 50 square metres, that would give 6000 / 50 = 120 Lux illuminance etc. You may aim two projectors onto the same surface, which doubles the Lux level. If the area is completely dark, like this castle for example https://lm3x.com/national-heritage/ then even 35 Lux (very low) may give a nice output, that is an example of extremely low illuminance combined with perfect conditions. Usually, we recommend 100 Lux to have a nice output in normal street conditions. If there are very strong sources of light around, even 150 – 250 Lux might be necessary, then the image is extremely bright and might even be too much. Our typical installations are around 50 – 80 Lux.