So it's nearly 2022 and it seems there have been more advances, I actually found a really affordable good quality light on Amazon.
I am amazed I actually managed to find a light that is half the price of this one and seems identical but if you look at the fine print you will notice the heatsink is half the thickness and the led's are glue covered wich reduces their output also the reviews says it had a tendency to break so avoid the cheap rubbish...
this one fingers crossed is not. It just arrived today and is built really well. Also has a 3 years warranty. For the price (less than a dollar a watt) I think this is one of the best grow lights out there.
It will illumate a 4 square meter area ( well maybe not that much but it is bright)
Amazon.com
ps for anyone in the uk it is called a vannect grow light but I have to admit I managed to take advantage of a special promtion that knocked £40 off the price, otherwise I probably would not have bought it so readily but it seems worth the price.
also make sure to apply any coupons offered.