^^^

Tell them, to build you a prototype.

If all goes well, you'll buy in bulk.

Advanced payment?
Nope. 1/3 payment when half is done.
1/3 payment when the unit is received.
1/3 payment when you're satisfied with the prototype.

Trust me man... I do wierd international business regulary... you're going to get fucked up the ass if you send them advanced payment.

As to a large order... hahaha!

Dude, they're trying to offload their surplus on you.
Also tell them to "fuck you". No large orders... prototype first.

What you going to do with shitloads of badly design bulbs? When they have your money?

Be smart man... be smart.

INTERESTIN!