I am keeping redfoots and I feel, that the brightness is not a concern as long as they are offered plenty of hiding places to feel secure (hide houses - half flower pots, areas with dense plants - artificial ones for now in my case, because they eat everything that is green). That way they might not be fully exposed to the light at all times, but even shorter periods are beneficial. Mine often are half digged into the moist spaghnum moss, but the head, front limbs and part of the carapace are exposed, as they like to observe, what's going on.
So I think, even though they might take a bit of time to get used to the intensity of the light, they will get used to it and start benefitting from it.
After all, these lamps are supposed to put out more UVB after a year of operation than a Reptisun 5.0 that is new.
My personal challenge is to find a good brand in Canada. Only the T-Rex brand is available here, and I used 4 bulbs in a bit more than a year. They simply break (even though they are never srewed in and out and are held by a lamp stand that protects from shaking / knocking it). And sending them to California for a refund every time is quite a drag, even though I sweared to myself, that with the last one, that I bought recently, I would, accompanied by an appropriate letter. I spent almost 400$ within a year to operate one lamp at a time.
This week I just put in an order to Big Apple Herpetological for a Powersun and 2 Capture the Sun Bulbs for comparison. It will still be cheaper for me to pay for shipping, customs and broker, if these hold up for at least a year each.
I like the principle of these Capture the Sun bulbs,- they work without a filament (and are the cheapest ones of the three types). And I think, that the filament is the weak part of at least the T-Rex bulbs.
Any input from other people concerning life span of the various brands (even though I realize, that even these bulbs should be changed after about a year, at least for the basking species) would be very appreciated!
Thanks, Gaby