Reddit reviews Chanzon LED Driver 900mA (Constant Current Output) 18V-39V (Input 100-240V AC-DC) (6-12)x3 18W 21W 24W 27W 30W 36W Power Supply 900 mA Lighting Transformer for High Power 30 W COB Chips (Plastic Case)
We found 2 Reddit comments about Chanzon LED Driver 900mA (Constant Current Output) 18V-39V (Input 100-240V AC-DC) (6-12)x3 18W 21W 24W 27W 30W 36W Power Supply 900 mA Lighting Transformer for High Power 30 W COB Chips (Plastic Case). Here are the top ones, ranked by their Reddit score.
Input: AC100-240V 50/60Hz Output: Current 900mA (Constant) ; Voltage 18-39V ; Power 18/21/24/27/30/36 W WattSize: 115.1*44.5*27.5 (mm) / 4.53*1.75*1.08 (inch) Net Weight: 90g / 3.2ozHigh Quality With CE Certificates Long Life Span No Noise Isolation Protection SafetyEfficiency:more than 89% Insulated(Low Heat) High Power Factor(PFC):more than 95% ReliabilityConstant Current Power Supply LED Drivers are used for most LED Products
The Chanzon drivers on amazon are pretty cheap and work amazing for me.
https://www.amazon.com/gp/product/B01MSANIYC/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A14FP9XIRL6C1F
I am also a neophyte, but have made several diy grow lights recently. Take everything I write with giant grains of salt.
You can buy a CXB3590 (3500 K, 36VDC) for $38 from digikey. An LED holder from newark ( http://www.newark.com/ideal/50-2303cr/led-holder-cree-cxa35-cob-array/dp/39X0077 ) runs about $3. You can buy a 900mA driver for it off amazon for $11 ( https://www.amazon.com/dp/B01MSANIYC ). You can buy a household AC box and a light switch for about $5 from home depot. Scrounge a PC AC cable, some wire for the DC side, some solder. Dig through old electronics for a good heat sink, a fan. Ask some computer folks for thermal paste.
That would bring you close to $50.
From that you can make a 30W led light, I think get over 5000 lumens, and it'd probably be pretty good quality, and not terribly dangerous.
For the AC side, do everything in the electrical box, and make sure it's grounded. Random stuff happens, don't let it happen to you. Electrical shock sucks, but poorly done AC wiring stuff could get hot, start a fire, so putting it in a box is a must. And it's really nice to have a the AC switch. You could simplify, leave out the switch, and use wire nuts, but it's still absolutely necessary to do that in a box and ground that box.
On the DC side, I used these barrel connectors ( https://www.amzn.com//B06Y4YXRMC ) with the wiring to the LED. It's also nice. EDIT: I don't know what these connectors are rated for, but they seemed pretty sturdy.
Sorry, again, I have some electronics background, but I'm new to lighting, so it's foolish of me to even comment.