I have had bad results with the Evolva lights. I bought 2 because they held so much promise for so little cost. Easy switching on and off, good lighting power, red mode. One flooded on second dive. I've been using lights and cameras for many years and know all about checking for dirty or pinched o-rings. Second one lasted a dozen dives before the switch went bonkers and it would start cycling through modes on it's own and be unable to switch off. You can read Amazon reviews and see many users have had the same experiences.
Meanwhile, my
Aqualite 100's have been on as many dives and continue to perform flawlessly. Of course, they cost almost $200 each while Evolva's are $50.