Does double watts equal double yield?

Let me bring you joy with my bucket of pak choi (bok choy). Use my coupon code gebgrowl to get 20% off on 30W & 40W grow lights from SANSI. (Expires 8/31/2018). I was compensated monetarily for including their products in this video. The code is good on their website at http://www.sansiled.com/products/category/Growlight and on Amazon at https://amzn.to/2JyRXtF The plant under the 30w bulb grew much faster than the one under the 15w bulb until the plant became cramped in the bucket. The tip burn is probably from high humidity in the bucket 85+ percent humidity. Music is "The Hours" by Phillip Glass