DIY resin 3d printer under 150$

My new version of the printer with LCD.
A test with 2 seconds per layer 0.025mm: https://www.youtube.com/watch?v=17U8ERGrhuo
2 seconds is less. Optim is 3-4 seconds.
How is built: https://www.youtube.com/watch?v=heHzuwF5B8E


LCD 3D Printer V4
Hardware:
- Raspberry PI 3
- LCD 5 inch 800x480 HDMI
- Drivers A4988 (Microstep=4)
- Stepper+threaded rod
- Matrix LED + controller
- power supply 5v 12V
- two metal rods
- magnets (HDD)
- Endstop
Software:
- NanoDLP - mode Movement GPIOs
Parameters:
- x/y 0.135mm
- Layer Thickness = 0.025mm
- Cure Time = 2 seconds
- Lift 2mm
- Daylight Resins

When the print is finished, do you have to be quick to clean the part from excessive resin? Or do you work in a dark room?

Can be washed in a room with normal light. Preferred to be warm light. Protect from cold or sun light.

I've searched the net for UV-LEDs and UV-hardening resin.
The prices for resin vary from 29€/liter to 79€/liter. I wonder what the difference is.

The LCD screen you are using is monochrome? Or can I use any LCD without backcover?