Does PAR add linearly?


New member
Quick question, if I have two 150w MH bulbs close together, at a certain PAR (going by Sanjay's numbers which uses a different system), will it add up to the total light of a 250w bulb that had that same PAR?

Now I know there are slight differences in that there'll be two sources instead of one so at any given point the energy might not be as intense however over the whole area it should be the same energy right? The laws of physics for extinction of light going into water don't change based on the wattage of the bulb right?