Keep your cuttings outdoors, but in the shade. Gro Lights are not recommended for roses generally, because it makes them leggy because of the constant "reaching" for the light. Actually, you could use ordinary flourescent tubes that lean towrd the red spectrum as opposed to daylight white.

I've had more success rooting my cuttings in my (unheated) garage under gro-lux lights ($7 or $8 per 48" tube). They do get pretty tall and leggy by mid-winter (I usually start them beginning of July here, after the first flush), but I decided to prune them by almost half then (I had no choice, since they were hitting the lights and I couldn't raise them any further). A couple formed buds inside. Once planted out in the spring, they rebounded nicely and are now doing very well, and ready to bloom.
Judith

I root cutting inside under regular fluorescent lights. Any hardware/big box store should have 4 ft fluorescent shop lights with or without bulbs.

If you are close to the coast in Southern California, the marine layer is a perfect sun cover providing mild temperatures and outside works fine. Put them on the north side of something so they'll be in shade. Also works if you are inland, but you have to watch them more carefully. I stuck some cuttings on the north side of a wall in poor soil, with all the foliage removed and just the very tip of the cutting out of the ground and...

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3 out of 5 have rooted. (the fencing is so the #%^#$^% rabbits don't eat them.) There's one there (leafless) on the left that rotted, rather than rooted. Maybe that one wasn't deep enough in the ground. I've done the baggie method and the soda bottle method, but this was far easier. The selection of cutting is really important. You want something that wants to grow. It should look really healthy, glowing with vitality.

You can get the correct light spectrum with an ordinary four foot inexpensive shop light using one warm white and one cool white fluorescent tube. I believe the common and inexpensive ones found in most stores are the cool white. You may have to ask around for the warm white bulb. They cost a little more and are harder to find.
But two of these bulbs together cost less than one grow bulb. Place the fixture just a few inches over the cuttings to reduce leggyness. Raise as the plants grow taller.

Having never been able to tell the difference between the 'warm white' side and the 'cool white' side, I just go with two cools. Given how close the lights should be to seedlings, they really aren't getting a good mix, but mostly the bulb over them.

I think if you 're rooting cuttings, rather than starting seedlings, lights that stimulate topgrowth are like to be counterproductive.
You don't want to grow TOP. You want to grow ROOTS.

Maele, I'm not sure where in SoCal you are, but in much of SoCal, Hoov's suggestions are right on.

We put "cloche's" under our one vigorous camellia bush. It's East-facing, but in bright dappled shade in the morning, and bright shade in the afternoon.
A "cloche" can be anything from a real garden cloche to the bottom two thirds of an empty vinegar bottle, with the top cut off, inverted over a cutting in a little pot or cup.

Here's one cutting under a "real" cloche, and another under an upended tupperware container. Just remember, they need to be kept wet. The cutting under the glass cloche here isn't wet enough inside. You need to see condensate moisture.

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Jeri

Here is a link that might be useful: A real glass cloche

Thank you, now I have a lot of useful information. So I plan to take care of all my plants this week, and figure out cuttings by the next week or two. I really think it might be too hot to do outside, since I am inland in the Pasadena area. Anyway if summer doesn't work for me, I can try in the fall on the north side of the house.
Now what I want to know is this: what is a good cutting? I'm not sure if I want one with new growth, since that usually produces buds, and I think that would not be good. TIA

Maele, look for a rose that has bloomed, and the bloom has faded and the petals fallen. Trim the dead dregs of the bloom off, and you have the makings of a cutting.
DH is going to do a talk on this in Camarillo, on 6-29, and you'd be welcome.
If that's inconvenient, try the pdf below (which really needs updating).

Jeri

Here is a link that might be useful: On Propagating

I really might try to get out to the talk on the 29th, at first I thought it was a weekend and I always work weekends, but a monday would be perfect. I will click on the link for info.
Thank you!