What are you trying to light up? A flood light underway will damage your night vision, and is not a good idea in reference to other boaters' vision. A quick flick on of a spotlight works for markers etc.
I have a magnetic mount tractor flood light which will clamp on the anchor, and give light over the bow, without any glare on the deck. I only use this in narrow channels, where I need to see the surface of the water.
If you want lights for the cockpit or fishing that is another issue. Many LED lights are very good for this and much smaller than typical "spreader" lights used in the past. You can mount some of these on the aft eye brow of the cabin, and have good illumination in the cockpit.
You can also mount lights on an aft radar arch.