TENS of thousands of happy spenders jammed the Convention and Exhibition Centre for two consumer shows yesterday, as the grey skies sent families looking for indoor entertainment. One visitor collapsed because of the heat and had to be revived by the St John Ambulance, and security guards with megaphones had to keep order to prevent a crush on the escalators ferrying families up to the shows on the fifth and seventh floors. The Electrical Home Appliances Expo '93 and Ideal Home Expo '93 were opened by Mr Martin Barrow, chairman of the Hongkong Tourist Association, and Mr Leo Lee, president of the Hongkong and Kowloon Electrical Appliances Merchants Association. After declaring that ''Hongkong people are becoming increasingly 'house-proud' and investing more to furnish their homes comfortably,'' Mr Barrow headed off into the exhibition hall to see the latest models of televisions, refrigerators, air-conditionersand more exotic products such as personal massagers. By mid-afternoon, there were ugly scenes outside the booth giving out free gifts, which had run out. After 30 minutes of explaining to aggrieved visitors that there were no more torches left, staff decided it would be easiest to partially disassemble the booth until this morning, when more will be available. A record 177 companies took stalls at the two shows, which run until April 12. This figure is 24 per cent above last year's figure. Mr Colin Lo, a spokesperson for the Trade Development Council (TDC), which is organising the shows, said visitor levels were much higher than last year, when 190,000 people crammed into the show over the four days. Appropriately, much of the exhibits were about keeping cool, with Kelvinator, Philips, Toshiba, Hitachi and other refrigerator manufacturers taking huge stands in the centre hall. Ironically, these refrigerators contributed to the heat by giving out more heat than they absorb, as any science student can confirm. Visitors were forced to show interest in even the most uncomfortable designer chairs to find a way of resting their legs, and the signs saying ''No sitting on the floor'', a traditional part of any TDC show, were surrounded by disobedient consumers forming squatter camps. Among the more unusual products on display were a ''sanitary washing system'' which was being demonstrated by two men wearing suits taking turns to sit on a real toilet which they set up on their stand.