I believe Plusrite is a distributor as well as a manufacturer. I am not certain but it looks like the OSRAM 400 20,000K MH is being distributed by Plusrite so that might be the bulb being sold.
The PAR for 400 watt 20,000K bulbs varies from 50 (South Pacific Sunlight) up to 150 (Happy Reefing & Radium). The Osram is in the middle with around 100.
And then, it could be a different bulb altogether. %%