Went to the store to get a bag of

80cm for veg and 60cm for flower is the general consensus - think you have a little leeway as LED's don't give off too much heat so no need to panic - it's a frequent issue for those of us that grow in small spaces / with restricted height. I have a GN Telos 0008 in my 3 x 3 x 5.8 tent and at 6 1/2 weeks tops of plants were 30cm away from the light. Had to get a little imaginative - got rid of the ratchet hangers and now the Telos is hanging directly on the support poles. [Given myself another 30cm to play with.] As has already been mentioned your ladies look to be in a good state of health. If you have some margin to raise the light then do so, otherwise you'll need to get creative - possible suppercropping might be the solution though my plan, should space again become an issue, is to pull the plants towards the corners of the tent where the light intensity will be a little lower. Keep on keeping on, you're doing a sterling job.