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very good charge pump current limiter completely hermetically sealed pushing 48 led's in series parallel the product is foolproof with more light output thaan a previous 50w halogen bulk BUT with hardly any heat , more light and the biggest plus ..just 590ma instead of a massive 4 amps with halogen 50w how could you resist this purchase?? a packet of 8 this price is enough to power your desk lamps for life! I have not though there is more because your 20w desk used 1.7amps with the original the new led can be run giving 30w light output still with a safe current and much greater cool light output ...so now you see Why the heading perfect