I bought this off eBay.
http://pages.ebay.com/link/?nav=item.view&id=140983139167
Its black scotch lite tape. In normal daylight you don’t even notice it on my black bike but at night i shine up like a christmas tree.
I also bought these lights for 12.99 which took a few weeks to arrive.
http://pages.ebay.com/link/?nav=item.view&id=350895076276
They are very bright but I doubt they are 2000 lumens! They have an alternate flash. This allows you to see a constant light but attracts attention. The change is instant so it doesn’t strobe. But there is a slight wobble left to right which you get used to. They run off 2 18650 batteries which you can change so you can replace mid ride.
So for less than 20 quid I can be spotted a mile off!