I've been down the artificial sunlight at home rabbit hole too (also inspired by the same DIY Perks video). Ultimately the solution I settled on was a much lower budget 300W equiv LED Corn style bulb (4000lm) with good CRI, and a 250w incandescent heat lamp (like you'd get for a reptile). I decided to focus on heat from the light source rather than the parallel rays. Total cost was around $75 (LEDs were $25 for 2, heat lamp was $10 for 2, plus $20 each for 2 lamp stands that clamp to a desk and can support 250 watts).