You plants will stay very green, the internode spacing will be super tight.
The fruit will be small but strong. i think you need to give some red to really get the fruit hearty
I agree with everything here minus the small part. I shit you not...my first grow was in a wardrobe closet with a 250W MH light, 6 Golden Skush plants and the dry yield was 9oz. dry. The buds were dense, as fat as soda cans and full of thc crystals. People who smoked dank everyday would take one hit and feel the effects. Some of the best smoke I have ever had personally. Granted, I did LST them, made sure the conditions were good and pushed them to the limit with feeding, but it was my first grow and I was impressed. Also, I think it depends on the strain. I had the journal on OG, but we all know what happened there.
In short...if it's all you have, use it. If you can afford a mixed spectrum (add hps) go for it. But either one will work and personally I would use only MH over HPS if I had to choose.