Biff, for some time now you've been weighing up the odds to blow / rub & buff the dust off your phallic-morphing lamp-olava-love-a-rama, bothered by subsequent drain on your batteries, not to mention worried about talk of comparible efforts

Worry not theres a new LED colour morphing heatplate, low voltage lava lamp out now (available in the autumn, as it was apparantly released on the sly last year & sold out fast)
No idea yet as to how little they pull compared to lava's of old, however I'm sure Biff will shortly furnish us with more details.
Linky
http://www.mathmos.com/mathmos-smart-astro-colour-changing-lava-lamp-20343-0.htmlWill fit in perfectly with your mathmos led blowlight.