Not directly. But, you can measure the current through the lights when they are powered with the correct voltage, then multiply those two numbers together to get the wattage.
It really depends on how much current the lights draw. If they’re just some 10mm LEDs or something, then you might be able to get away with powering them from the vesc, but if they draw more power, then the only options you have are either power it from the main battery, or add a little extra battery just to run the lights.
Those look like commercial lights, so they should have a rating on them, e.g. 12v 300ma or 12v 5w. If not, you can use a multimeter to check the voltage and current.
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How do I check that on the multimeter again?
turn the multimeter on, switch it to DC20v and put the pins on the pos and neg
I mean how do I measure watt and or amps with multimeter?
8-50V input 12V1.5A or 12V3A version available, nothing to adjust just plug and play There are 5V output versions too
https://www.amazon.com/DROK-Converter-Transformer-Inverter-Automotive/dp/B01739WR7O/
You put the multimeter in series in the circuit in amps mode and power flows through it, they will have a rated max amps on the multimeter but usually fused so if you go over you just have to replace a fuse (too much and I’ve heard they can blow in your hands but shouldn’t be an issue here). The Watts is just volts*amps so if you have two meters you can get that accurately if not you can measure no load voltage then multiply the amps you measure by volts to tell you watts. For a given component (LED in this case) you can measure the voltage drop from one side of the component to the other and multiply by the amperage to know the watts. Example say you have 500mA at 5V that’s 2.5W (0.5A * 5V = 2.5W)
I always fall back on this:
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The wires to this one above and mine require such small wires, will that limit battery flow or circuitrestricti? It seems restricting
The wires it comes with do 12V3A without issue If length is the issue,extend them
Installed 5 of these last week,3x12, 2x5 on 4 client builds, no problems yet 
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I mean the power wires running my 12 guage through this unit seems limiting
I don’t understand what you mean by limiting…
Do you think I could solder 12 guage to them in series and be ok? Doesn’t seem like it, but great product! I’m going to buy it!
Oh, yeah you can soldering anything equal or thicker than what’s on there, i used 14 gauge for extensions
How to wire up a voltage regulator like that u posted?
one end to battery the other end to what you are powering
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I bought a 3 LED version which lasted one night, and then I got the 2 LED version which lasted about 10 minutes. There is a coil inside that is free floating above the circuit board. On the 3 LED version it looks like it shorted out a little chip at R2. On the two LED version the coil fell off the solder points. I will try soldering it back on. I think it needs some big gobs of silicone to prevent the coil from moving around.
We use these lights and they have been great! Sorry to hear about the short.
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Thanks @psychotiller . Do your lights have the same coil inside? If so do you support it in some way?
Maybe I have exceptionally shitty roads, or exceptionally shitty luck.