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A well informed reply there, thanks 
I was just trying to sort out why on earth the DV6000 range have 2 types of power board (just the circuit the charging socket actually sits on), and this web page has helped me get the ideas sorted in my head. On my own workbench I use a modified 20volt 6.8amp charger, to just work all the things I get (except them pesky IBM and TOSHIBA models with 16/15v needed)..
It does seem that the DV range with a 90watt power board have the twin lamps as mentioned previously by G-pack (and I wonder if blu-ray on the CD drive has anything to do with that ?, also do some batteries have more cells in though externally the same ?)
If you need to check if yours is a 90 or 65watt version, quickest/easiest way is to just take the power button panel off (held in place by 3 silver screws under the battery, and it then clips off from the top, the screen hinge covers stay in place tho - be careful as it has a wire and 2 ribbon cables hidden under that plastic panel)
Once the panels removed, on the 90watt model, you will see wires near the hinges like this:-
Left side = main large video connector with pull-up tab attached, thin black wire for left lamp bulb.
Right side = 1 thin black wire for right-hand bulb (goes to the centre of motherboard), and the WiFi aerial wires (black & grey).
The 65watt charger will power a 90watt version, but it will strain the charger no doubt when the screens on full, and the DVD-writer is writing (that's when it's all needing the most power). At a guess i'd say at that point it'll be looking for around 75-80 watts and that's going to really hurt a cheap quality charger 
One technical point of these kinds of things that may be worth mentioning is, a lower powered charger will also blow itself when things go wrong (sometimes), rather than allowing a higher wattage to get pulled thru. This may be a good reason for the ratings being as they are from the manufacturer.
If a 90watt charger is attached, it will allow a far higher power drain to a faulty shorting (leaking) component, and as such (in theory) allow more risk of mainboard damage while the charger happily takes the strain.
Saying that tho, look at me still using my benches 6.8amp beasty - go figure lol.
Okay, enough from me, good luck with these things everybody.
