Unfortunately, the official ProTank 'colored' glass is extremely pale. I got a set and was disappointed, so I started searching for alternatives online. FastTech has 6-7 colors IIRC, but the photos are wrong on their website, so if you order deep red, you'll get a dark orange. I ordered a whole set and picked the best colors. Dark orange and dark green were the best. Their pink and blue is a little darker than Kanger's, so I used them instead. Sure wish I got a dark red one though. As popular as the ProTanks are, I'm surprised I haven't found anyone making a selection of colors.
UPDATE: I decided to do some more searching for colored replacement glass, and was reminded just how much Kanger is trying to fool you into thinking they're offering rich colors. Their official photos, and most online shops, must REALLY crank up the color in their photos - they look NOTHING like the photos. Keep that in mind when you order...
Marketing like that really upsets me. Rant over. Please return to your previous activity!