A 1N4007 is very slow. It was designed to work at 60hz. It will not be happy working at switching power supply speeds.1N1007
I agree a driver would be the best way to go but since the LED is only a cheap 30w COB or a 100w driven with a 12vdc Walwart and a 150v dc-dc converter for my indoor pepper garden been working pretty good I just through things together around the house and because things break I'd like to know how they work so I can repair if needed that's why I'd like to build. I used this guy's example of learning about conductors made this simple device that worksA 1N4007 is very slow. It was designed to work at 60hz. It will not be happy working at switching power supply speeds.
I think you need to order parts any whay.
Next: What LED are you using? I think you should get a LED power supply not a 30vdc power supply. They are on ebay also.
A power supply for 100W, 30V, 3.3A for LEDs will regulate at 3.3A not 30V. LEDs are current not voltage devices.