With an actual draw of 100 watts you should be fine, the p1000 shouldn't be too over whelming. Pay attention to leaf temps, don't want them getting too cold. Not sure what bulb size you use now but 100 watts wont keep them leaf temps up.
I switched from hps to the
hlg half way and bleached a few top nugs. But its a bit more led than the p1000. Heat took me by surprise.. the
hlg pulls 630 watts though and it doesn't have controlled air tubes like the hps I used prior.
Pay attention to your ladies. If this is your smoke supply maybe consider waiting it out. When I switched I kind of didn't care because I had a great harvest prior. But regardless I still got decent nugs, just a few adjustments were needed like with adding anything new in a controlled environment.
Best of luck!!!!