I cannot compare a P7 to a DiNotte, but I can say that it blows my 6V 15W halogen Marwi Nightpro Torch out of the water.

I paid over $100 for the Marwi system (light, mount, bottle cage battery, charger) from an online dealer.

I paid a BF member < $40 for an MTE SSC P7 2 mode light, (2) 18650 batteries and a charger. I already had some lock blocks, or I would have needed to buy a mount.

The P7 in a lock block takes up about the same amount of room on the bars, but is a bit harder to adjust up and down and cannot really be aimed side to side if bar mounted with a lock block.

I have not had a single problem with either light. Had over a hundred hours on the halogen. Have about 3 or 4 hours on the P7 so not apples to apples here either, but they are proven lights, so I do not expect problems.

The P7 can easily be used off the bike for camping trips, etc. The dedicated bike light, not so much.

Spare batteries are not expensive and you could easily carry three or four in a saddle bag or pocket if you were going for a long ride. The dedicated bike light has a bottle cage battery that is expensive to replace and hard to carry a spare on the bike and still have room for a bottle of water. With the P7, I can use both my bottle cages for water again.

The P7 puts out more, brighter, whiter light, has the same run time and costs 40% of what I paid for a real "bike light"

I would have no problem at all telling you to get a P7, some batteries, a charger and some lock blocks. I would even say get two p7s and mount one on your helmet to allow you to look into corners, shine at cars approaching from side streets, light up your computer, etc.