Question about Beurer TL 50 EnergyLight

TL most likely stands for daylight lamp and the number behind it is the specific product. The difference is the additional functions such as alarm clock, timer, dimming etc which come with the more expensive products. I use mine in the office, so the TL 50 is enough for me, but if you want to use it as an alarm clock, you should go for the TL 100.