I just wrote to "Terraluxcorp.com" and once again requested their efforts to market a single LED bulb upgrade for our worklights. I noticed on the "Battteryjunction.com" site that there is a upgrade available for the 4 to 6 D cell Maglites which might be adaptable to our needs. According to the specs for this product the TLE-300, it is rated at 600 lumens which is extremely bright and up to 24 volts DC. Lower voltages will work fine but it is the higher voltage that caught my attention. This product is not cheap at $94.00 and it was out of stock, but imagine never having to buy another bulb and get longer run time and brighter light to boot? I asked the folks at Terra Lux to please consider marketing this product so it fits our workight bulb receptacle.