Very energy-saving. I have had the lamp on for 72 hours, the 90 Ah battery has only decreased by 0.2 volts. It uses practically no power and shines very brightly. 2 nautical miles.
The SVB socket is substantially equivalent to the conventional lamp. Warm light, a little more powerful than the classic lamp given as equivalent, and more homogeneous lighting all around the lamp.
This LED bulb was installed in a spotlight that lights the engine compartment of our sailboat to replace a filament bulb, much more powerful lighting and much lower consumption.
I have bought other LED lights from SVB that were advertised as a substitute for 10 watt and they were rubbish...absolute rubbish providing very little light and nothing like the 10 watts that was advertised.