They are not a fan of bright lights, when they bask it could damage their eyes.
I have a planted tank and I use LEDs (Finnex Ray2) and it's very strong so what I came up with is I use a glass lid and I bought some plastic to go underneath them, like the kind people put under fluorescent lighting and cut it out so it rests on top of my glass lid and it diffuses the light and makes it so where it's not blinding. My plants still grow just fine, too.
All my ACF were purchased at LFS in my area, I've never seen them at a PetCo or PetSmart.
EDIT:
Speaking of lighting, just some ideas for you.
What type of plants are you growing? In my experience, floating plants or low light plants work best. You don't need a TON of light for floating plants since they will are in close proximity.
A light I picked up and I REALLY like is the Current Satellite LED+ fixture. What is cool about it is that it has a remote control you can control the RGB (red green blue) of the lights and create custom colors, weather effects, and control brightness as well. I would consider it a low light fixture though so you can't really have a 'serious' planted tank with it.
On my 40B I use a Finnex Ray2 to light the rear of my tank (highest density of plants) and the Satellite Current LED+ on the front of the tank to add supplemental light and since the Ray2 only runs a few hours a day for plant growth, I use the Current LED for evening viewing. From 6pm to 10pm I turn it to a cool brown/green swampy color scheme and it looks really awesome and the frogs become quite active in the subdued lighting as well.
I could probably get away with just using the Current LED but I like having the Ray2 run a few hours a day to make sure my plants get all the light they need, my tank is pretty dense with plants though.. on a 20G you could probably do just fine with the Current LED. With a Ray2 unless you diffuse or can anchor it above your tank to add height between it and the substrate, you will almost certainly have algae issues.





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