I use pro heat panels as does Nephrurus on this site.
They are a fantstic unit specifically designed for the needs of reptiles. Generally you need to provide them with cage dimensions, cage materials, species to be kept and ambient day and night max and mins for the season.
They need this information to calculate the correct product to meet your needs.
I've only used the 88W panels, I think Neph has the 110W panels for womas. The are ideal for aboreal or terrestrial species. If using for terrestrial species i would suggest the instillation of a shelf or the addition of branches as so they can get nearer the panel to bask.
They maintain quite a good gradient very stable and can be used easily with thermostats (how dare i say that word)
Pluses, they look good, don't require light guards as the surface temperatures are nowhere near that of a light globe, No globe replacement ever, 10 year warranty, they are very helpful, energy efficient.
Disadvantages, they are not sold in Australia
The main sizes used are 55W , 88W and 110W panels although they can custom make sizes for specific requirements. I find them price efficient compared to my set-ups.
In a 6ft*2ft*2ft cage I use a basking globe of 100W and two back up blue globes for night (that also supplement day heat on cool days on dual thermostats) Or dual 60W ceramic heat emmiters instead of blue lights.
A cost of this setup is around $150 give or take including light covers. In relation the cost of an 88W pro heat panel delivered in around $200
I guess the cost of replacement globes alone would make the panel better value over 10 years let alone much more energy efficient.
I tried getting technical information from the company that makes a certain Australian heat panel and the technician could only give me the advice that they are good to put under desks etc to warm your knees! That was about all they could tell me. So the choice was simple.
Cheers
