Whilst looking for some random stuff to use as an entry to CRX’s giveaway I came across LEDs Magazine. I had a quick search on here and couldn’t find it mentioned so decided to post a link to it in case some of you have an interest in it’s contents. LEDs Magazine
They have a website as well as a digital magazine you can flick through, which appears to be monthly. Anyway, enjoy if of interest. 
Unfortunately pdf download doesn’t seem to be an option even though they say it is if you subscribe.