Six metres? It is probably too dark. Six metres from a very large floor-to-ceiling south-facing window would perhaps be OK, but anything else would be too dark. The 100W incandescent bulb puts out too little light to do anything useful. Maybe you have a camera to get a rough light meter reading?

Here is a link that might be useful: Camera as light meter

I do know a simple incandecent light can interrupt the blooming habits on some plant. I am not familiar with much of anything but cacti and succulents though. I do know a common jade, which I have several, is sensitive to photoperiod, needing 12 hours of less to induce blooming in the winter, so even simple dim living room lights will interrupt, and cease blooming.